diff --git a/sys/dev/age/if_age.c b/sys/dev/age/if_age.c
index 7bc56a75da0c..829f350b08f5 100644
--- a/sys/dev/age/if_age.c
+++ b/sys/dev/age/if_age.c
@@ -1521,7 +1521,7 @@ age_encap(struct age_softc *sc, struct mbuf **m_head)
 
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			/* Release original mbufs. */
 			m_freem(*m_head);
 			if (m == NULL) {
@@ -1599,7 +1599,7 @@ age_encap(struct age_softc *sc, struct mbuf **m_head)
 	error =  bus_dmamap_load_mbuf_sg(sc->age_cdata.age_tx_tag, map,
 	    *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, AGE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, AGE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -3061,7 +3061,7 @@ age_newbuf(struct age_softc *sc, struct age_rxdesc *rxd)
 
 	AGE_LOCK_ASSERT(sc);
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
diff --git a/sys/dev/alc/if_alc.c b/sys/dev/alc/if_alc.c
index 9fa29b8db137..2ee9513009c6 100644
--- a/sys/dev/alc/if_alc.c
+++ b/sys/dev/alc/if_alc.c
@@ -2047,7 +2047,7 @@ alc_encap(struct alc_softc *sc, struct mbuf **m_head)
 
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			/* Release original mbufs. */
 			m_freem(*m_head);
 			if (m == NULL) {
@@ -2125,7 +2125,7 @@ alc_encap(struct alc_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->alc_cdata.alc_tx_tag, map,
 	    *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, ALC_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, ALC_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -2803,7 +2803,7 @@ alc_newbuf(struct alc_softc *sc, struct alc_rxdesc *rxd)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = RX_BUF_SIZE_MAX;
@@ -2923,7 +2923,7 @@ alc_fixup_rx(struct ifnet *ifp, struct mbuf *m)
 	 * header from the mbuf chain. This can save lots of CPU
 	 * cycles for jumbo frame.
 	 */
-	MGETHDR(n, M_DONTWAIT, MT_DATA);
+	MGETHDR(n, M_NOWAIT, MT_DATA);
 	if (n == NULL) {
 		ifp->if_iqdrops++;
 		m_freem(m);
diff --git a/sys/dev/ale/if_ale.c b/sys/dev/ale/if_ale.c
index f1f35ed9d529..9537388d3e56 100644
--- a/sys/dev/ale/if_ale.c
+++ b/sys/dev/ale/if_ale.c
@@ -1640,7 +1640,7 @@ ale_encap(struct ale_softc *sc, struct mbuf **m_head)
 
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			/* Release original mbufs. */
 			m_freem(*m_head);
 			if (m == NULL) {
@@ -1657,7 +1657,7 @@ ale_encap(struct ale_softc *sc, struct mbuf **m_head)
 		if ((sc->ale_flags & ALE_FLAG_TXCSUM_BUG) != 0 &&
 		    (m->m_pkthdr.csum_flags & ALE_CSUM_FEATURES) != 0 &&
 		    (mtod(m, intptr_t) & 3) != 0) {
-			m = m_defrag(*m_head, M_DONTWAIT);
+			m = m_defrag(*m_head, M_NOWAIT);
 			if (m == NULL) {
 				*m_head = NULL;
 				return (ENOBUFS);
@@ -1742,7 +1742,7 @@ ale_encap(struct ale_softc *sc, struct mbuf **m_head)
 	error =  bus_dmamap_load_mbuf_sg(sc->ale_cdata.ale_tx_tag, map,
 	    *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, ALE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, ALE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/an/if_an.c b/sys/dev/an/if_an.c
index 5d90850086e1..b2a13df8447a 100644
--- a/sys/dev/an/if_an.c
+++ b/sys/dev/an/if_an.c
@@ -946,12 +946,12 @@ an_rxeof(struct an_softc *sc)
 			/* dump raw 802.11 packet to bpf and skip ip stack */
 			BPF_TAP(ifp, bpf_buf, len);
 		} else {
-			MGETHDR(m, M_DONTWAIT, MT_DATA);
+			MGETHDR(m, M_NOWAIT, MT_DATA);
 			if (m == NULL) {
 				ifp->if_ierrors++;
 				return;
 			}
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if (!(m->m_flags & M_EXT)) {
 				m_freem(m);
 				ifp->if_ierrors++;
@@ -1037,12 +1037,12 @@ an_rxeof(struct an_softc *sc)
 			if (an_rx_desc.an_done && !an_rx_desc.an_valid) {
 				buf = sc->an_rx_buffer[count].an_dma_vaddr;
 
-				MGETHDR(m, M_DONTWAIT, MT_DATA);
+				MGETHDR(m, M_NOWAIT, MT_DATA);
 				if (m == NULL) {
 					ifp->if_ierrors++;
 					return;
 				}
-				MCLGET(m, M_DONTWAIT);
+				MCLGET(m, M_NOWAIT);
 				if (!(m->m_flags & M_EXT)) {
 					m_freem(m);
 					ifp->if_ierrors++;
diff --git a/sys/dev/ath/if_ath_rx.c b/sys/dev/ath/if_ath_rx.c
index 3ebfb2ffe0bc..543ba4381808 100644
--- a/sys/dev/ath/if_ath_rx.c
+++ b/sys/dev/ath/if_ath_rx.c
@@ -232,7 +232,7 @@ ath_legacy_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
 		 * multiple of the cache line size.  Not doing this
 		 * causes weird stuff to happen (for the 5210 at least).
 		 */
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m == NULL) {
 			DPRINTF(sc, ATH_DEBUG_ANY,
 				"%s: no mbuf/cluster\n", __func__);
diff --git a/sys/dev/ath/if_ath_rx_edma.c b/sys/dev/ath/if_ath_rx_edma.c
index dc7fd9ac4fcc..301a22cc060f 100644
--- a/sys/dev/ath/if_ath_rx_edma.c
+++ b/sys/dev/ath/if_ath_rx_edma.c
@@ -518,7 +518,7 @@ ath_edma_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
 
 	ATH_RX_LOCK_ASSERT(sc);
 
-	m = m_getm(NULL, sc->sc_edma_bufsize, M_DONTWAIT, MT_DATA);
+	m = m_getm(NULL, sc->sc_edma_bufsize, M_NOWAIT, MT_DATA);
 	if (! m)
 		return (ENOBUFS);		/* XXX ?*/
 
diff --git a/sys/dev/ath/if_ath_tx.c b/sys/dev/ath/if_ath_tx.c
index 7f97af40ca78..199d890029d2 100644
--- a/sys/dev/ath/if_ath_tx.c
+++ b/sys/dev/ath/if_ath_tx.c
@@ -325,7 +325,7 @@ ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
 	 */
 	if (bf->bf_nseg > ATH_TXDESC) {		/* too many desc's, linearize */
 		sc->sc_stats.ast_tx_linear++;
-		m = m_collapse(m0, M_DONTWAIT, ATH_TXDESC);
+		m = m_collapse(m0, M_NOWAIT, ATH_TXDESC);
 		if (m == NULL) {
 			ath_freetx(m0);
 			sc->sc_stats.ast_tx_nombuf++;
diff --git a/sys/dev/bce/if_bce.c b/sys/dev/bce/if_bce.c
index 1fb583f713cb..2471f1926ccd 100644
--- a/sys/dev/bce/if_bce.c
+++ b/sys/dev/bce/if_bce.c
@@ -5437,9 +5437,9 @@ bce_get_rx_buf(struct bce_softc *sc, struct mbuf *m, u16 *prod,
 
 		/* This is a new mbuf allocation. */
 		if (bce_hdr_split == TRUE)
-			MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+			MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		else
-			m_new = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+			m_new = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 			    sc->rx_bd_mbuf_alloc_size);
 
 		if (m_new == NULL) {
@@ -5559,7 +5559,7 @@ bce_get_pg_buf(struct bce_softc *sc, struct mbuf *m, u16 *prod,
 		    goto bce_get_pg_buf_exit);
 
 		/* This is a new mbuf allocation. */
-		m_new = m_getcl(M_DONTWAIT, MT_DATA, 0);
+		m_new = m_getcl(M_NOWAIT, MT_DATA, 0);
 		if (m_new == NULL) {
 			sc->mbuf_alloc_failed_count++;
 			rc = ENOBUFS;
@@ -7320,7 +7320,7 @@ bce_tso_setup(struct bce_softc *sc, struct mbuf **m_head, u16 *flags)
 
 	/* Controller may modify mbuf chains. */
 	if (M_WRITABLE(*m_head) == 0) {
-		m = m_dup(*m_head, M_DONTWAIT);
+		m = m_dup(*m_head, M_NOWAIT);
 		m_freem(*m_head);
 		if (m == NULL) {
 			sc->mbuf_alloc_failed_count++;
@@ -7486,7 +7486,7 @@ bce_tx_encap(struct bce_softc *sc, struct mbuf **m_head)
 		sc->mbuf_frag_count++;
 
 		/* Try to defrag the mbuf. */
-		m0 = m_collapse(*m_head, M_DONTWAIT, BCE_MAX_SEGMENTS);
+		m0 = m_collapse(*m_head, M_NOWAIT, BCE_MAX_SEGMENTS);
 		if (m0 == NULL) {
 			/* Defrag was unsuccessful */
 			m_freem(*m_head);
diff --git a/sys/dev/bfe/if_bfe.c b/sys/dev/bfe/if_bfe.c
index 06c8fdab14ad..be7e2a4053bf 100644
--- a/sys/dev/bfe/if_bfe.c
+++ b/sys/dev/bfe/if_bfe.c
@@ -791,7 +791,7 @@ bfe_list_newbuf(struct bfe_softc *sc, int c)
 	u_int32_t ctrl;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
 
 	if (bus_dmamap_load_mbuf_sg(sc->bfe_rxmbuf_tag, sc->bfe_rx_sparemap,
@@ -1519,7 +1519,7 @@ bfe_encap(struct bfe_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->bfe_txmbuf_tag, r->bfe_map, *m_head,
 	    txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, BFE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, BFE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/bge/if_bge.c b/sys/dev/bge/if_bge.c
index 9855bbd2ae86..e7cb2f7a5e26 100644
--- a/sys/dev/bge/if_bge.c
+++ b/sys/dev/bge/if_bge.c
@@ -1312,12 +1312,12 @@ bge_newbuf_std(struct bge_softc *sc, int i)
 	if (sc->bge_flags & BGE_FLAG_JUMBO_STD &&
 	    (sc->bge_ifp->if_mtu + ETHER_HDR_LEN + ETHER_CRC_LEN +
 	    ETHER_VLAN_ENCAP_LEN > (MCLBYTES - ETHER_ALIGN))) {
-		m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
+		m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
 		if (m == NULL)
 			return (ENOBUFS);
 		m->m_len = m->m_pkthdr.len = MJUM9BYTES;
 	} else {
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m == NULL)
 			return (ENOBUFS);
 		m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1368,11 +1368,11 @@ bge_newbuf_jumbo(struct bge_softc *sc, int i)
 	struct mbuf *m;
 	int error, nsegs;
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		return (ENOBUFS);
 
-	m_cljget(m, M_DONTWAIT, MJUM9BYTES);
+	m_cljget(m, M_NOWAIT, MJUM9BYTES);
 	if (!(m->m_flags & M_EXT)) {
 		m_freem(m);
 		return (ENOBUFS);
@@ -4946,7 +4946,7 @@ bge_cksum_pad(struct mbuf *m)
 			/* Allocate new empty mbuf, pad it. Compact later. */
 			struct mbuf *n;
 
-			MGET(n, M_DONTWAIT, MT_DATA);
+			MGET(n, M_NOWAIT, MT_DATA);
 			if (n == NULL)
 				return (ENOBUFS);
 			n->m_len = 0;
@@ -4988,7 +4988,7 @@ bge_check_short_dma(struct mbuf *m)
 	}
 
 	if (found > 1) {
-		n = m_defrag(m, M_DONTWAIT);
+		n = m_defrag(m, M_NOWAIT);
 		if (n == NULL)
 			m_freem(m);
 	} else
@@ -5008,7 +5008,7 @@ bge_setup_tso(struct bge_softc *sc, struct mbuf *m, uint16_t *mss,
 
 	if (M_WRITABLE(m) == 0) {
 		/* Get a writable copy. */
-		n = m_dup(m, M_DONTWAIT);
+		n = m_dup(m, M_NOWAIT);
 		m_freem(m);
 		if (n == NULL)
 			return (NULL);
@@ -5125,9 +5125,9 @@ bge_encap(struct bge_softc *sc, struct mbuf **m_head, uint32_t *txidx)
 			 * DMA read operation.
 			 */
 			if (sc->bge_forced_collapse == 1)
-				m = m_defrag(m, M_DONTWAIT);
+				m = m_defrag(m, M_NOWAIT);
 			else
-				m = m_collapse(m, M_DONTWAIT,
+				m = m_collapse(m, M_NOWAIT,
 				    sc->bge_forced_collapse);
 			if (m == NULL)
 				m = *m_head;
@@ -5139,7 +5139,7 @@ bge_encap(struct bge_softc *sc, struct mbuf **m_head, uint32_t *txidx)
 	error = bus_dmamap_load_mbuf_sg(sc->bge_cdata.bge_tx_mtag, map, m, segs,
 	    &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(m, M_DONTWAIT, BGE_NSEG_NEW);
+		m = m_collapse(m, M_NOWAIT, BGE_NSEG_NEW);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/bm/if_bm.c b/sys/dev/bm/if_bm.c
index 01706dfeb5e1..cce5ee387e59 100644
--- a/sys/dev/bm/if_bm.c
+++ b/sys/dev/bm/if_bm.c
@@ -539,7 +539,7 @@ bm_dummypacket(struct bm_softc *sc)
 
 	ifp = sc->sc_ifp;
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 
 	if (m == NULL)
 		return;
@@ -793,7 +793,7 @@ bm_encap(struct bm_softc *sc, struct mbuf **m_head)
 	    *m_head, segs, &nsegs, BUS_DMA_NOWAIT);
 
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, nsegs);
+		m = m_collapse(*m_head, M_NOWAIT, nsegs);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -1238,7 +1238,7 @@ bm_add_rxbuf(struct bm_softc *sc, int idx)
 	bus_dma_segment_t segs[1];
 	int error, nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
diff --git a/sys/dev/bwi/if_bwi.c b/sys/dev/bwi/if_bwi.c
index cb4805b258af..25b5f2bc16d4 100644
--- a/sys/dev/bwi/if_bwi.c
+++ b/sys/dev/bwi/if_bwi.c
@@ -2534,7 +2534,7 @@ bwi_newbuf(struct bwi_softc *sc, int buf_idx, int init)
 
 	KASSERT(buf_idx < BWI_RX_NDESC, ("buf_idx %d", buf_idx));
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL) {
 		error = ENOBUFS;
 
@@ -3015,7 +3015,7 @@ bwi_encap(struct bwi_softc *sc, int idx, struct mbuf *m,
 	/*
 	 * Setup the embedded TX header
 	 */
-	M_PREPEND(m, sizeof(*hdr), M_DONTWAIT);
+	M_PREPEND(m, sizeof(*hdr), M_NOWAIT);
 	if (m == NULL) {
 		if_printf(ifp, "%s: prepend TX header failed\n", __func__);
 		return ENOBUFS;
@@ -3074,7 +3074,7 @@ bwi_encap(struct bwi_softc *sc, int idx, struct mbuf *m,
 	if (error) {	/* error == EFBIG */
 		struct mbuf *m_new;
 
-		m_new = m_defrag(m, M_DONTWAIT);
+		m_new = m_defrag(m, M_NOWAIT);
 		if (m_new == NULL) {
 			if_printf(ifp, "%s: can't defrag TX buffer\n",
 			    __func__);
@@ -3195,7 +3195,7 @@ bwi_encap_raw(struct bwi_softc *sc, int idx, struct mbuf *m,
 	/*
 	 * Setup the embedded TX header
 	 */
-	M_PREPEND(m, sizeof(*hdr), M_DONTWAIT);
+	M_PREPEND(m, sizeof(*hdr), M_NOWAIT);
 	if (m == NULL) {
 		if_printf(ifp, "%s: prepend TX header failed\n", __func__);
 		return ENOBUFS;
@@ -3249,7 +3249,7 @@ bwi_encap_raw(struct bwi_softc *sc, int idx, struct mbuf *m,
 			    __func__, error);
 			goto back;
 		}
-		m_new = m_defrag(m, M_DONTWAIT);
+		m_new = m_defrag(m, M_NOWAIT);
 		if (m_new == NULL) {
 			if_printf(ifp, "%s: can't defrag TX buffer\n",
 			    __func__);
diff --git a/sys/dev/bwn/if_bwn.c b/sys/dev/bwn/if_bwn.c
index b2cd52731cb7..94797b319851 100644
--- a/sys/dev/bwn/if_bwn.c
+++ b/sys/dev/bwn/if_bwn.c
@@ -1428,7 +1428,7 @@ bwn_pio_tx_start(struct bwn_mac *mac, struct ieee80211_node *ni, struct mbuf *m)
 		/*
 		 * XXX please removes m_defrag(9)
 		 */
-		m_new = m_defrag(m, M_DONTWAIT);
+		m_new = m_defrag(m, M_NOWAIT);
 		if (m_new == NULL) {
 			device_printf(sc->sc_dev,
 			    "%s: can't defrag TX buffer\n",
@@ -1544,7 +1544,7 @@ bwn_dma_tx_start(struct bwn_mac *mac, struct ieee80211_node *ni, struct mbuf *m)
 	if (error) {    /* error == EFBIG */
 		struct mbuf *m_new;
 
-		m_new = m_defrag(m, M_DONTWAIT);
+		m_new = m_defrag(m, M_NOWAIT);
 		if (m_new == NULL) {
 			if_printf(ifp, "%s: can't defrag TX buffer\n",
 			    __func__);
@@ -9124,7 +9124,7 @@ bwn_pio_rxeof(struct bwn_pio_rxqueue *prq)
 	padding = (macstat & BWN_RX_MAC_PADDING) ? 2 : 0;
 	totlen = len + padding;
 	KASSERT(totlen <= MCLBYTES, ("too big..\n"));
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL) {
 		device_printf(sc->sc_dev, "%s: out of memory", __func__);
 		goto error;
@@ -9183,7 +9183,7 @@ bwn_dma_newbuf(struct bwn_dma_ring *dr, struct bwn_dmadesc_generic *desc,
 	struct mbuf *m;
 	int error;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL) {
 		error = ENOBUFS;
 
diff --git a/sys/dev/bxe/if_bxe.c b/sys/dev/bxe/if_bxe.c
index 1193865a1cf0..52d2c1bc174e 100644
--- a/sys/dev/bxe/if_bxe.c
+++ b/sys/dev/bxe/if_bxe.c
@@ -3757,7 +3757,7 @@ bxe_alloc_buf_rings(struct bxe_softc *sc)
 
 		if (fp != NULL) {
 			fp->br = buf_ring_alloc(BXE_BR_SIZE,
-			    M_DEVBUF, M_DONTWAIT, &fp->mtx);
+			    M_DEVBUF, M_NOWAIT, &fp->mtx);
 			if (fp->br == NULL) {
 				rc = ENOMEM;
 				goto bxe_alloc_buf_rings_exit;
@@ -8960,7 +8960,7 @@ bxe_tx_encap(struct bxe_fastpath *fp, struct mbuf **m_head)
 		} else if (error == EFBIG) {
 			/* Possibly recoverable with defragmentation. */
 			fp->mbuf_defrag_attempts++;
-			m0 = m_defrag(*m_head, M_DONTWAIT);
+			m0 = m_defrag(*m_head, M_NOWAIT);
 			if (m0 == NULL) {
 				fp->mbuf_defrag_failures++;
 				rc = ENOBUFS;
@@ -10467,7 +10467,7 @@ bxe_alloc_tpa_mbuf(struct bxe_fastpath *fp, int queue)
 #endif
 
 	/* Allocate the new TPA mbuf. */
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, sc->mbuf_alloc_size);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, sc->mbuf_alloc_size);
 	if (__predict_false(m == NULL)) {
 		fp->mbuf_tpa_alloc_failed++;
 		rc = ENOBUFS;
@@ -10661,7 +10661,7 @@ bxe_alloc_rx_sge_mbuf(struct bxe_fastpath *fp, uint16_t index)
 #endif
 
 	/* Allocate a new SGE mbuf. */
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, SGE_PAGE_SIZE);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, SGE_PAGE_SIZE);
 	if (__predict_false(m == NULL)) {
 		fp->mbuf_sge_alloc_failed++;
 		rc = ENOMEM;
@@ -10851,7 +10851,7 @@ bxe_alloc_rx_bd_mbuf(struct bxe_fastpath *fp, uint16_t index)
 #endif
 
 	/* Allocate the new RX BD mbuf. */
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, sc->mbuf_alloc_size);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, sc->mbuf_alloc_size);
 	if (__predict_false(m == NULL)) {
 		fp->mbuf_rx_bd_alloc_failed++;
 		rc = ENOBUFS;
diff --git a/sys/dev/cas/if_cas.c b/sys/dev/cas/if_cas.c
index 8705ac709101..f846350eee54 100644
--- a/sys/dev/cas/if_cas.c
+++ b/sys/dev/cas/if_cas.c
@@ -1192,7 +1192,7 @@ cas_load_txmbuf(struct cas_softc *sc, struct mbuf **m_head)
 	cflags = 0;
 	if (((*m_head)->m_pkthdr.csum_flags & CAS_CSUM_FEATURES) != 0) {
 		if (M_WRITABLE(*m_head) == 0) {
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			*m_head = m;
 			if (m == NULL)
@@ -1215,7 +1215,7 @@ cas_load_txmbuf(struct cas_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->sc_tdmatag, txs->txs_dmamap,
 	    *m_head, txsegs, &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, CAS_NTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, CAS_NTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -1714,7 +1714,7 @@ cas_rint(struct cas_softc *sc)
 			    __func__, idx, off, len);
 #endif
 			rxds = &sc->sc_rxdsoft[idx];
-			MGETHDR(m, M_DONTWAIT, MT_DATA);
+			MGETHDR(m, M_NOWAIT, MT_DATA);
 			if (m != NULL) {
 				refcount_acquire(&rxds->rxds_refcount);
 				bus_dmamap_sync(sc->sc_rdmatag,
@@ -1759,7 +1759,7 @@ cas_rint(struct cas_softc *sc)
 			    __func__, idx, off, len);
 #endif
 			rxds = &sc->sc_rxdsoft[idx];
-			MGETHDR(m, M_DONTWAIT, MT_DATA);
+			MGETHDR(m, M_NOWAIT, MT_DATA);
 			if (m != NULL) {
 				refcount_acquire(&rxds->rxds_refcount);
 				off += ETHER_ALIGN;
@@ -1796,7 +1796,7 @@ cas_rint(struct cas_softc *sc)
 #endif
 				rxds2 = &sc->sc_rxdsoft[idx2];
 				if (m != NULL) {
-					MGET(m2, M_DONTWAIT, MT_DATA);
+					MGET(m2, M_NOWAIT, MT_DATA);
 					if (m2 != NULL) {
 						refcount_acquire(
 						    &rxds2->rxds_refcount);
diff --git a/sys/dev/ce/if_ce.c b/sys/dev/ce/if_ce.c
index 7fb208a02d8d..700ab80a8899 100644
--- a/sys/dev/ce/if_ce.c
+++ b/sys/dev/ce/if_ce.c
@@ -319,10 +319,10 @@ static struct mbuf *makembuf (void *buf, unsigned len)
 {
 	struct mbuf *m;
 
-	MGETHDR (m, M_DONTWAIT, MT_DATA);
+	MGETHDR (m, M_NOWAIT, MT_DATA);
 	if (! m)
 		return 0;
-	MCLGET (m, M_DONTWAIT);
+	MCLGET (m, M_NOWAIT);
 	if (! (m->m_flags & M_EXT)) {
 		m_freem (m);
 		return 0;
diff --git a/sys/dev/cm/smc90cx6.c b/sys/dev/cm/smc90cx6.c
index eb8967576cc8..f7ceae601354 100644
--- a/sys/dev/cm/smc90cx6.c
+++ b/sys/dev/cm/smc90cx6.c
@@ -502,7 +502,7 @@ cm_srint_locked(vsc)
 	buffer = sc->sc_rx_act ^ 1;
 
 	/* Allocate header mbuf */
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 
 	if (m == 0) {
 		/*
@@ -539,7 +539,7 @@ cm_srint_locked(vsc)
 	 */
 	if ((len + 2 + 2) > MHLEN) {
 		/* attach an mbuf cluster */
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 
 		/* Insist on getting a cluster */
 		if ((m->m_flags & M_EXT) == 0) {
diff --git a/sys/dev/cp/if_cp.c b/sys/dev/cp/if_cp.c
index 49e329e85af3..4ff0bccd5c9d 100644
--- a/sys/dev/cp/if_cp.c
+++ b/sys/dev/cp/if_cp.c
@@ -203,10 +203,10 @@ static struct mbuf *makembuf (void *buf, unsigned len)
 {
 	struct mbuf *m;
 
-	MGETHDR (m, M_DONTWAIT, MT_DATA);
+	MGETHDR (m, M_NOWAIT, MT_DATA);
 	if (! m)
 		return 0;
-	MCLGET (m, M_DONTWAIT);
+	MCLGET (m, M_NOWAIT);
 	if (! (m->m_flags & M_EXT)) {
 		m_freem (m);
 		return 0;
diff --git a/sys/dev/cs/if_cs.c b/sys/dev/cs/if_cs.c
index 3789ea48e076..c89760abcfaf 100644
--- a/sys/dev/cs/if_cs.c
+++ b/sys/dev/cs/if_cs.c
@@ -726,12 +726,12 @@ cs_get_packet(struct cs_softc *sc)
 		return (-1);
 	}
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m==NULL)
 		return (-1);
 
 	if (length > MHLEN) {
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 		if (!(m->m_flags & M_EXT)) {
 			m_freem(m);
 			return (-1);
diff --git a/sys/dev/ctau/if_ct.c b/sys/dev/ctau/if_ct.c
index dbdca97411d0..7b4abc3f0131 100644
--- a/sys/dev/ctau/if_ct.c
+++ b/sys/dev/ctau/if_ct.c
@@ -205,10 +205,10 @@ static struct mbuf *makembuf (void *buf, u_int len)
 {
 	struct mbuf *m;
 
-	MGETHDR (m, M_DONTWAIT, MT_DATA);
+	MGETHDR (m, M_NOWAIT, MT_DATA);
 	if (! m)
 		return 0;
-	MCLGET (m, M_DONTWAIT);
+	MCLGET (m, M_NOWAIT);
 	if (! (m->m_flags & M_EXT)) {
 		m_freem (m);
 		return 0;
diff --git a/sys/dev/cx/if_cx.c b/sys/dev/cx/if_cx.c
index c8f53a00bec7..cb154867dff4 100644
--- a/sys/dev/cx/if_cx.c
+++ b/sys/dev/cx/if_cx.c
@@ -252,13 +252,13 @@ static struct mbuf *makembuf (void *buf, u_int len)
 {
 	struct mbuf *m, *o, *p;
 
-	MGETHDR (m, M_DONTWAIT, MT_DATA);
+	MGETHDR (m, M_NOWAIT, MT_DATA);
 
 	if (! m)
 		return 0;
 
 	if (len >= MINCLSIZE)
-		MCLGET (m, M_DONTWAIT);
+		MCLGET (m, M_NOWAIT);
 
 	m->m_pkthdr.len = len;
 	m->m_len = 0;
@@ -271,13 +271,13 @@ static struct mbuf *makembuf (void *buf, u_int len)
 		if (! n) {
 			/* Allocate new mbuf. */
 			o = p;
-			MGET (p, M_DONTWAIT, MT_DATA);
+			MGET (p, M_NOWAIT, MT_DATA);
 			if (! p) {
 				m_freem (m);
 				return 0;
 			}
 			if (len >= MINCLSIZE)
-				MCLGET (p, M_DONTWAIT);
+				MCLGET (p, M_NOWAIT);
 			p->m_len = 0;
 			o->m_next = p;
 
diff --git a/sys/dev/cxgb/cxgb_main.c b/sys/dev/cxgb/cxgb_main.c
index 455c7235747d..fee0653fbfd9 100644
--- a/sys/dev/cxgb/cxgb_main.c
+++ b/sys/dev/cxgb/cxgb_main.c
@@ -1442,7 +1442,7 @@ send_pktsched_cmd(struct adapter *adap, int sched, int qidx, int lo,
 	struct mbuf *m;
 	struct mngt_pktsched_wr *req;
 
-	m = m_gethdr(M_DONTWAIT, MT_DATA);
+	m = m_gethdr(M_NOWAIT, MT_DATA);
 	if (m) {	
 		req = mtod(m, struct mngt_pktsched_wr *);
 		req->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_MNGT));
diff --git a/sys/dev/cxgb/cxgb_sge.c b/sys/dev/cxgb/cxgb_sge.c
index 0108339ffd56..3a5d8f6fbfdc 100644
--- a/sys/dev/cxgb/cxgb_sge.c
+++ b/sys/dev/cxgb/cxgb_sge.c
@@ -2710,7 +2710,7 @@ get_packet(adapter_t *adap, unsigned int drop_thres, struct sge_qset *qs,
 	
 	if (recycle_enable && len <= SGE_RX_COPY_THRES &&
 	    sopeop == RSPQ_SOP_EOP) {
-		if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
+		if ((m = m_gethdr(M_NOWAIT, MT_DATA)) == NULL)
 			goto skip_recycle;
 		cl = mtod(m, void *);
 		memcpy(cl, sd->rxsd_cl, len);
@@ -2866,10 +2866,10 @@ process_responses(adapter_t *adap, struct sge_qset *qs, int budget)
 				printf("async notification\n");
 
 			if (mh->mh_head == NULL) {
-				mh->mh_head = m_gethdr(M_DONTWAIT, MT_DATA);
+				mh->mh_head = m_gethdr(M_NOWAIT, MT_DATA);
 				m = mh->mh_head;
 			} else {
-				m = m_gethdr(M_DONTWAIT, MT_DATA);
+				m = m_gethdr(M_NOWAIT, MT_DATA);
 			}
 			if (m == NULL)
 				goto no_mem;
@@ -2882,7 +2882,7 @@ process_responses(adapter_t *adap, struct sge_qset *qs, int budget)
                         rspq->async_notif++;
 			goto skip;
 		} else if  (flags & F_RSPD_IMM_DATA_VALID) {
-			struct mbuf *m = m_gethdr(M_DONTWAIT, MT_DATA);
+			struct mbuf *m = m_gethdr(M_NOWAIT, MT_DATA);
 
 			if (m == NULL) {	
 		no_mem:
diff --git a/sys/dev/cxgb/sys/uipc_mvec.c b/sys/dev/cxgb/sys/uipc_mvec.c
index f52daa681b13..dea5500c2ed9 100644
--- a/sys/dev/cxgb/sys/uipc_mvec.c
+++ b/sys/dev/cxgb/sys/uipc_mvec.c
@@ -98,7 +98,7 @@ busdma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
 			printf("mbuf chain too long: %d max allowed %d\n",
 			    seg_count, TX_MAX_SEGS);
 		if (!defragged) {
-			n = m_defrag(*m, M_DONTWAIT);
+			n = m_defrag(*m, M_NOWAIT);
 			if (n == NULL) {
 				err = ENOBUFS;
 				goto err_out;
diff --git a/sys/dev/cxgbe/t4_sge.c b/sys/dev/cxgbe/t4_sge.c
index fa33d1833a68..62d9eb3902ed 100644
--- a/sys/dev/cxgbe/t4_sge.c
+++ b/sys/dev/cxgbe/t4_sge.c
@@ -2761,7 +2761,7 @@ start:	sgl->nsegs = 0;
 	rc = bus_dmamap_load_mbuf_sg(txq->tx_tag, txm->map, m, sgl->seg,
 	    &sgl->nsegs, BUS_DMA_NOWAIT);
 	if (rc == EFBIG && defragged == 0) {
-		m = m_defrag(m, M_DONTWAIT);
+		m = m_defrag(m, M_NOWAIT);
 		if (m == NULL)
 			return (EFBIG);
 
diff --git a/sys/dev/cxgbe/tom/t4_ddp.c b/sys/dev/cxgbe/tom/t4_ddp.c
index 31eb607fcf66..16eb707c70cf 100644
--- a/sys/dev/cxgbe/tom/t4_ddp.c
+++ b/sys/dev/cxgbe/tom/t4_ddp.c
@@ -1207,7 +1207,7 @@ t4_soreceive_ddp(struct socket *so, struct sockaddr **psa, struct uio *uio,
 			KASSERT(sb->sb_mb != NULL,
 			    ("%s: len > 0 && sb->sb_mb empty", __func__));
 
-			m = m_copym(sb->sb_mb, 0, len, M_DONTWAIT);
+			m = m_copym(sb->sb_mb, 0, len, M_NOWAIT);
 			if (m == NULL)
 				len = 0;	/* Don't flush data from sockbuf. */
 			else
diff --git a/sys/dev/cxgbe/tom/t4_listen.c b/sys/dev/cxgbe/tom/t4_listen.c
index e5c457d0a777..523f7f345503 100644
--- a/sys/dev/cxgbe/tom/t4_listen.c
+++ b/sys/dev/cxgbe/tom/t4_listen.c
@@ -1164,7 +1164,7 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
 		 * or may not be stashed in the original SYN mbuf passed to us.
 		 * Just copy it over instead of dealing with all possibilities.
 		 */
-		m = m_dup(synqe->syn, M_DONTWAIT);
+		m = m_dup(synqe->syn, M_NOWAIT);
 		if (m)
 			m->m_pkthdr.rcvif = ifp;
 
diff --git a/sys/dev/dc/if_dc.c b/sys/dev/dc/if_dc.c
index 01f49749f3eb..2c8d1ca250de 100644
--- a/sys/dev/dc/if_dc.c
+++ b/sys/dev/dc/if_dc.c
@@ -2650,7 +2650,7 @@ dc_newbuf(struct dc_softc *sc, int i)
 	bus_dma_segment_t segs[1];
 	int error, nseg;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -3387,7 +3387,7 @@ dc_encap(struct dc_softc *sc, struct mbuf **m_head)
 	defragged = 0;
 	if (sc->dc_flags & DC_TX_COALESCE &&
 	    ((*m_head)->m_next != NULL || sc->dc_flags & DC_TX_ALIGN)) {
-		m = m_defrag(*m_head, M_DONTWAIT);
+		m = m_defrag(*m_head, M_NOWAIT);
 		defragged = 1;
 	} else {
 		/*
@@ -3402,7 +3402,7 @@ dc_encap(struct dc_softc *sc, struct mbuf **m_head)
 		if (i > DC_TX_LIST_CNT / 4 ||
 		    DC_TX_LIST_CNT - i + sc->dc_cdata.dc_tx_cnt <=
 		    DC_TX_LIST_RSVD) {
-			m = m_collapse(*m_head, M_DONTWAIT, DC_MAXFRAGS);
+			m = m_collapse(*m_head, M_NOWAIT, DC_MAXFRAGS);
 			defragged = 1;
 		}
 	}
@@ -3419,7 +3419,7 @@ dc_encap(struct dc_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->dc_tx_mtag,
 	    sc->dc_cdata.dc_tx_map[idx], *m_head, segs, &nseg, 0);
 	if (error == EFBIG) {
-		if (defragged != 0 || (m = m_collapse(*m_head, M_DONTWAIT,
+		if (defragged != 0 || (m = m_collapse(*m_head, M_NOWAIT,
 		    DC_MAXFRAGS)) == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/de/if_de.c b/sys/dev/de/if_de.c
index 2503961bc36f..ace5542c5014 100644
--- a/sys/dev/de/if_de.c
+++ b/sys/dev/de/if_de.c
@@ -257,7 +257,7 @@ tulip_txprobe(tulip_softc_t * const sc)
      * to verify the connectivity.
      */
     TULIP_LOCK_ASSERT(sc);
-    MGETHDR(m, M_DONTWAIT, MT_DATA);
+    MGETHDR(m, M_NOWAIT, MT_DATA);
     if (m == NULL)
 	return 0;
     /*
@@ -3517,7 +3517,7 @@ tulip_rx_intr(tulip_softc_t * const sc)
 	    ms->m_pkthdr.len = total_len;
 	    ms->m_pkthdr.rcvif = ifp;
 	    m0 = ms;
-	    ms = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	    ms = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 #endif
 	    TULIP_UNLOCK(sc);
 	    CTR1(KTR_TULIP, "tulip_rx_intr: passing %p to upper layer", m0);
@@ -3528,7 +3528,7 @@ tulip_rx_intr(tulip_softc_t * const sc)
 	     * If we are priming the TULIP with mbufs, then allocate
 	     * a new cluster for the next descriptor.
 	     */
-	    ms = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	    ms = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 
 #ifndef __NO_STRICT_ALIGNMENT
     skip_input:
@@ -3970,7 +3970,7 @@ tulip_txput(tulip_softc_t * const sc, struct mbuf *m)
 	     * to recopy it into one mbuf and then try again.  If
 	     * we can't recopy it, try again later.
 	     */
-	    m0 = m_defrag(m, M_DONTWAIT);
+	    m0 = m_defrag(m, M_NOWAIT);
 	    if (m0 == NULL) {
 		sc->tulip_flags |= TULIP_WANTTXSTART;
 #if defined(TULIP_DEBUG)
diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c
index 112b538f5585..8ba32e00d834 100644
--- a/sys/dev/e1000/if_em.c
+++ b/sys/dev/e1000/if_em.c
@@ -1831,7 +1831,7 @@ em_xmit(struct tx_ring *txr, struct mbuf **m_headp)
 		if (do_tso || (m_head->m_next != NULL && 
 		    m_head->m_pkthdr.csum_flags & CSUM_OFFLOAD)) {
 			if (M_WRITABLE(*m_headp) == 0) {
-				m_head = m_dup(*m_headp, M_DONTWAIT);
+				m_head = m_dup(*m_headp, M_NOWAIT);
 				m_freem(*m_headp);
 				if (m_head == NULL) {
 					*m_headp = NULL;
@@ -1948,7 +1948,7 @@ em_xmit(struct tx_ring *txr, struct mbuf **m_headp)
 	if (error == EFBIG && remap) {
 		struct mbuf *m;
 
-		m = m_defrag(*m_headp, M_DONTWAIT);
+		m = m_defrag(*m_headp, M_NOWAIT);
 		if (m == NULL) {
 			adapter->mbuf_alloc_failed++;
 			m_freem(*m_headp);
@@ -3930,7 +3930,7 @@ em_refresh_mbufs(struct rx_ring *rxr, int limit)
 	while (j != limit) {
 		rxbuf = &rxr->rx_buffers[i];
 		if (rxbuf->m_head == NULL) {
-			m = m_getjcl(M_DONTWAIT, MT_DATA,
+			m = m_getjcl(M_NOWAIT, MT_DATA,
 			    M_PKTHDR, adapter->rx_mbuf_sz);
 			/*
 			** If we have a temporary resource shortage
@@ -4100,7 +4100,7 @@ em_setup_receive_ring(struct rx_ring *rxr)
 			continue;
 		}
 #endif /* DEV_NETMAP */
-		rxbuf->m_head = m_getjcl(M_DONTWAIT, MT_DATA,
+		rxbuf->m_head = m_getjcl(M_NOWAIT, MT_DATA,
 		    M_PKTHDR, adapter->rx_mbuf_sz);
 		if (rxbuf->m_head == NULL) {
 			error = ENOBUFS;
@@ -4579,7 +4579,7 @@ em_fixup_rx(struct rx_ring *rxr)
 		bcopy(m->m_data, m->m_data + ETHER_HDR_LEN, m->m_len);
 		m->m_data += ETHER_HDR_LEN;
 	} else {
-		MGETHDR(n, M_DONTWAIT, MT_DATA);
+		MGETHDR(n, M_NOWAIT, MT_DATA);
 		if (n != NULL) {
 			bcopy(m->m_data, n->m_data, ETHER_HDR_LEN);
 			m->m_data += ETHER_HDR_LEN;
diff --git a/sys/dev/e1000/if_igb.c b/sys/dev/e1000/if_igb.c
index cf70965232ca..8eb3011799e9 100644
--- a/sys/dev/e1000/if_igb.c
+++ b/sys/dev/e1000/if_igb.c
@@ -1830,7 +1830,7 @@ igb_xmit(struct tx_ring *txr, struct mbuf **m_headp)
 		if (do_tso || (m_head->m_next != NULL && 
 		    m_head->m_pkthdr.csum_flags & CSUM_OFFLOAD)) {
 			if (M_WRITABLE(*m_headp) == 0) {
-				m_head = m_dup(*m_headp, M_DONTWAIT);
+				m_head = m_dup(*m_headp, M_NOWAIT);
 				m_freem(*m_headp);
 				if (m_head == NULL) {
 					*m_headp = NULL;
@@ -1935,7 +1935,7 @@ igb_xmit(struct tx_ring *txr, struct mbuf **m_headp)
 	if (error == EFBIG && remap) {
 		struct mbuf *m;
 
-		m = m_defrag(*m_headp, M_DONTWAIT);
+		m = m_defrag(*m_headp, M_NOWAIT);
 		if (m == NULL) {
 			adapter->mbuf_defrag_failed++;
 			m_freem(*m_headp);
@@ -3983,7 +3983,7 @@ igb_refresh_mbufs(struct rx_ring *rxr, int limit)
 		if (rxr->hdr_split == FALSE)
 			goto no_split;
 		if (rxbuf->m_head == NULL) {
-			mh = m_gethdr(M_DONTWAIT, MT_DATA);
+			mh = m_gethdr(M_NOWAIT, MT_DATA);
 			if (mh == NULL)
 				goto update;
 		} else
@@ -4009,7 +4009,7 @@ igb_refresh_mbufs(struct rx_ring *rxr, int limit)
 		    htole64(hseg[0].ds_addr);
 no_split:
 		if (rxbuf->m_pack == NULL) {
-			mp = m_getjcl(M_DONTWAIT, MT_DATA,
+			mp = m_getjcl(M_NOWAIT, MT_DATA,
 			    M_PKTHDR, adapter->rx_mbuf_sz);
 			if (mp == NULL)
 				goto update;
@@ -4225,7 +4225,7 @@ igb_setup_receive_ring(struct rx_ring *rxr)
 			goto skip_head;
 
 		/* First the header */
-		rxbuf->m_head = m_gethdr(M_DONTWAIT, MT_DATA);
+		rxbuf->m_head = m_gethdr(M_NOWAIT, MT_DATA);
 		if (rxbuf->m_head == NULL) {
 			error = ENOBUFS;
                         goto fail;
@@ -4247,7 +4247,7 @@ igb_setup_receive_ring(struct rx_ring *rxr)
 
 skip_head:
 		/* Now the payload cluster */
-		rxbuf->m_pack = m_getjcl(M_DONTWAIT, MT_DATA,
+		rxbuf->m_pack = m_getjcl(M_NOWAIT, MT_DATA,
 		    M_PKTHDR, adapter->rx_mbuf_sz);
 		if (rxbuf->m_pack == NULL) {
 			error = ENOBUFS;
diff --git a/sys/dev/e1000/if_lem.c b/sys/dev/e1000/if_lem.c
index aeb32952de68..58e6c7eefba0 100644
--- a/sys/dev/e1000/if_lem.c
+++ b/sys/dev/e1000/if_lem.c
@@ -1566,7 +1566,7 @@ lem_xmit(struct adapter *adapter, struct mbuf **m_headp)
 	if (error == EFBIG) {
 		struct mbuf *m;
 
-		m = m_defrag(*m_headp, M_DONTWAIT);
+		m = m_defrag(*m_headp, M_NOWAIT);
 		if (m == NULL) {
 			adapter->mbuf_alloc_failed++;
 			m_freem(*m_headp);
@@ -3075,7 +3075,7 @@ lem_get_buf(struct adapter *adapter, int i)
 	struct em_buffer	*rx_buffer;
 	int			error, nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL) {
 		adapter->mbuf_cluster_failed++;
 		return (ENOBUFS);
@@ -3633,7 +3633,7 @@ lem_fixup_rx(struct adapter *adapter)
 		bcopy(m->m_data, m->m_data + ETHER_HDR_LEN, m->m_len);
 		m->m_data += ETHER_HDR_LEN;
 	} else {
-		MGETHDR(n, M_DONTWAIT, MT_DATA);
+		MGETHDR(n, M_NOWAIT, MT_DATA);
 		if (n != NULL) {
 			bcopy(m->m_data, n->m_data, ETHER_HDR_LEN);
 			m->m_data += ETHER_HDR_LEN;
diff --git a/sys/dev/ed/if_ed.c b/sys/dev/ed/if_ed.c
index 80446a6fe120..a84fc758f0b3 100644
--- a/sys/dev/ed/if_ed.c
+++ b/sys/dev/ed/if_ed.c
@@ -1268,7 +1268,7 @@ ed_get_packet(struct ed_softc *sc, bus_size_t buf, u_short len)
 	struct mbuf *m;
 
 	/* Allocate a header mbuf */
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		return;
 	m->m_pkthdr.rcvif = ifp;
@@ -1282,7 +1282,7 @@ ed_get_packet(struct ed_softc *sc, bus_size_t buf, u_short len)
 	 */
 	if ((len + 2) > MHLEN) {
 		/* Attach an mbuf cluster */
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 
 		/* Insist on getting a cluster */
 		if ((m->m_flags & M_EXT) == 0) {
diff --git a/sys/dev/en/midway.c b/sys/dev/en/midway.c
index 3b57ce3569ef..ee12b201b97a 100644
--- a/sys/dev/en/midway.c
+++ b/sys/dev/en/midway.c
@@ -837,15 +837,15 @@ copy_mbuf(struct mbuf *m)
 {
 	struct mbuf *new;
 
-	MGET(new, M_WAIT, MT_DATA);
+	MGET(new, M_WAITOK, MT_DATA);
 
 	if (m->m_flags & M_PKTHDR) {
 		M_MOVE_PKTHDR(new, m);
 		if (m->m_len > MHLEN)
-			MCLGET(new, M_WAIT);
+			MCLGET(new, M_WAITOK);
 	} else {
 		if (m->m_len > MLEN)
-			MCLGET(new, M_WAIT);
+			MCLGET(new, M_WAITOK);
 	}
 
 	bcopy(m->m_data, new->m_data, m->m_len);
@@ -1925,7 +1925,7 @@ en_mget(struct en_softc *sc, u_int pktlen)
 	 * words at the begin.
 	 */
 	/* called from interrupt context */
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		return (NULL);
 
@@ -1940,7 +1940,7 @@ en_mget(struct en_softc *sc, u_int pktlen)
 		totlen -= m->m_len;
 
 		/* called from interrupt context */
-		tmp = m_getm(m, totlen, M_DONTWAIT, MT_DATA);
+		tmp = m_getm(m, totlen, M_NOWAIT, MT_DATA);
 		if (tmp == NULL) {
 			m_free(m);
 			return (NULL);
@@ -2924,7 +2924,7 @@ en_attach(struct en_softc *sc)
 	    &en_utopia_methods);
 	utopia_init_media(&sc->utopia);
 
-	MGET(sc->padbuf, M_WAIT, MT_DATA);
+	MGET(sc->padbuf, M_WAITOK, MT_DATA);
 	bzero(sc->padbuf->m_data, MLEN);
 
 	if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), 1, 0,
diff --git a/sys/dev/ep/if_ep.c b/sys/dev/ep/if_ep.c
index 7be1f80daecb..183c5f484227 100644
--- a/sys/dev/ep/if_ep.c
+++ b/sys/dev/ep/if_ep.c
@@ -746,11 +746,11 @@ epread(struct ep_softc *sc)
 	rx_fifo = rx_fifo2 = status & RX_BYTES_MASK;
 
 	if (EP_FTST(sc, F_RX_FIRST)) {
-		MGETHDR(m, M_DONTWAIT, MT_DATA);
+		MGETHDR(m, M_NOWAIT, MT_DATA);
 		if (!m)
 			goto out;
 		if (rx_fifo >= MINCLSIZE)
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 		sc->top = sc->mcur = top = m;
 #define EROUND  ((sizeof(struct ether_header) + 3) & ~3)
 #define EOFF    (EROUND - sizeof(struct ether_header))
@@ -774,11 +774,11 @@ epread(struct ep_softc *sc)
 		lenthisone = min(rx_fifo, M_TRAILINGSPACE(m));
 		if (lenthisone == 0) {	/* no room in this one */
 			mcur = m;
-			MGET(m, M_DONTWAIT, MT_DATA);
+			MGET(m, M_NOWAIT, MT_DATA);
 			if (!m)
 				goto out;
 			if (rx_fifo >= MINCLSIZE)
-				MCLGET(m, M_DONTWAIT);
+				MCLGET(m, M_NOWAIT);
 			m->m_len = 0;
 			mcur->m_next = m;
 			lenthisone = min(rx_fifo, M_TRAILINGSPACE(m));
diff --git a/sys/dev/et/if_et.c b/sys/dev/et/if_et.c
index dfdcde73438b..3d73c9c5c147 100644
--- a/sys/dev/et/if_et.c
+++ b/sys/dev/et/if_et.c
@@ -2169,7 +2169,7 @@ et_encap(struct et_softc *sc, struct mbuf **m0)
 	error = bus_dmamap_load_mbuf_sg(sc->sc_tx_tag, map, *m0, segs, &nsegs,
 	    0);
 	if (error == EFBIG) {
-		m = m_collapse(*m0, M_DONTWAIT, ET_NSEG_MAX);
+		m = m_collapse(*m0, M_NOWAIT, ET_NSEG_MAX);
 		if (m == NULL) {
 			m_freem(*m0);
 			*m0 = NULL;
@@ -2331,7 +2331,7 @@ et_newbuf_cluster(struct et_rxbuf_data *rbd, int buf_idx)
 	int nsegs;
 
 	MPASS(buf_idx < ET_RX_NDESC);
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -2390,7 +2390,7 @@ et_newbuf_hdr(struct et_rxbuf_data *rbd, int buf_idx)
 	int nsegs;
 
 	MPASS(buf_idx < ET_RX_NDESC);
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MHLEN;
diff --git a/sys/dev/ex/if_ex.c b/sys/dev/ex/if_ex.c
index 1034dacdd5de..a91a3cc2dcd4 100644
--- a/sys/dev/ex/if_ex.c
+++ b/sys/dev/ex/if_ex.c
@@ -733,7 +733,7 @@ ex_rx_intr(struct ex_softc *sc)
 		QQQ = pkt_len = CSR_READ_2(sc, IO_PORT_REG);
 
 		if (rx_status & RCV_OK_bit) {
-			MGETHDR(m, M_DONTWAIT, MT_DATA);
+			MGETHDR(m, M_NOWAIT, MT_DATA);
 			ipkt = m;
 			if (ipkt == NULL) {
 				ifp->if_iqdrops++;
@@ -744,7 +744,7 @@ ex_rx_intr(struct ex_softc *sc)
 
 				while (pkt_len > 0) {
 					if (pkt_len >= MINCLSIZE) {
-						MCLGET(m, M_DONTWAIT);
+						MCLGET(m, M_NOWAIT);
 						if (m->m_flags & M_EXT) {
 							m->m_len = MCLBYTES;
 						} else {
@@ -769,7 +769,7 @@ ex_rx_intr(struct ex_softc *sc)
 					pkt_len -= m->m_len;
 
 					if (pkt_len > 0) {
-						MGET(m->m_next, M_DONTWAIT, MT_DATA);
+						MGET(m->m_next, M_NOWAIT, MT_DATA);
 						if (m->m_next == NULL) {
 							m_freem(ipkt);
 							ifp->if_iqdrops++;
diff --git a/sys/dev/fatm/if_fatm.c b/sys/dev/fatm/if_fatm.c
index 8ddda95d7b43..9020d22d5884 100644
--- a/sys/dev/fatm/if_fatm.c
+++ b/sys/dev/fatm/if_fatm.c
@@ -1099,7 +1099,7 @@ fatm_supply_small_buffers(struct fatm_softc *sc)
 				if_printf(sc->ifp, "out of rbufs\n");
 				break;
 			}
-			MGETHDR(m, M_DONTWAIT, MT_DATA);
+			MGETHDR(m, M_NOWAIT, MT_DATA);
 			if (m == NULL) {
 				LIST_INSERT_HEAD(&sc->rbuf_free, rb, link);
 				break;
@@ -1189,7 +1189,7 @@ fatm_supply_large_buffers(struct fatm_softc *sc)
 				if_printf(sc->ifp, "out of rbufs\n");
 				break;
 			}
-			if ((m = m_getcl(M_DONTWAIT, MT_DATA,
+			if ((m = m_getcl(M_NOWAIT, MT_DATA,
 			    M_PKTHDR)) == NULL) {
 				LIST_INSERT_HEAD(&sc->rbuf_free, rb, link);
 				break;
@@ -1768,17 +1768,17 @@ copy_mbuf(struct mbuf *m)
 {
 	struct mbuf *new;
 
-	MGET(new, M_DONTWAIT, MT_DATA);
+	MGET(new, M_NOWAIT, MT_DATA);
 	if (new == NULL)
 		return (NULL);
 
 	if (m->m_flags & M_PKTHDR) {
 		M_MOVE_PKTHDR(new, m);
 		if (m->m_len > MHLEN)
-			MCLGET(new, M_WAIT);
+			MCLGET(new, M_WAITOK);
 	} else {
 		if (m->m_len > MLEN)
-			MCLGET(new, M_WAIT);
+			MCLGET(new, M_WAITOK);
 	}
 
 	bcopy(m->m_data, new->m_data, m->m_len);
diff --git a/sys/dev/fe/if_fe.c b/sys/dev/fe/if_fe.c
index 7bfca2ab4ff4..5883b6bc54b5 100644
--- a/sys/dev/fe/if_fe.c
+++ b/sys/dev/fe/if_fe.c
@@ -1870,13 +1870,13 @@ fe_get_packet (struct fe_softc * sc, u_short len)
 	 */
 
 	/* Allocate an mbuf with packet header info.  */
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		return -1;
 
 	/* Attach a cluster if this packet doesn't fit in a normal mbuf.  */
 	if (len > MHLEN - NFS_MAGIC_OFFSET) {
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 		if (!(m->m_flags & M_EXT)) {
 			m_freem(m);
 			return -1;
diff --git a/sys/dev/firewire/fwohci.c b/sys/dev/firewire/fwohci.c
index 4b147b2ab139..77886d3adfa8 100644
--- a/sys/dev/firewire/fwohci.c
+++ b/sys/dev/firewire/fwohci.c
@@ -977,7 +977,7 @@ fwohci_start(struct fwohci_softc *sc, struct fwohci_dbch *dbch)
 
 				if (firewire_debug)
 					device_printf(sc->fc.dev, "EFBIG.\n");
-				m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+				m0 = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 				if (m0 != NULL) {
 					m_copydata(xfer->mbuf, 0,
 						xfer->mbuf->m_pkthdr.len,
diff --git a/sys/dev/firewire/if_fwe.c b/sys/dev/firewire/if_fwe.c
index fa51026a1de1..615cb07bbbef 100644
--- a/sys/dev/firewire/if_fwe.c
+++ b/sys/dev/firewire/if_fwe.c
@@ -357,7 +357,7 @@ fwe_init(void *arg)
 		STAILQ_INIT(&xferq->stdma);
 		xferq->stproc = NULL;
 		for (i = 0; i < xferq->bnchunk; i ++) {
-			m = m_getcl(M_WAIT, MT_DATA, M_PKTHDR);
+			m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
 			xferq->bulkxfer[i].mbuf = m;
 			m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
 			STAILQ_INSERT_TAIL(&xferq->stfree,
@@ -606,7 +606,7 @@ fwe_as_output(struct fwe_softc *fwe, struct ifnet *ifp)
 #endif
 
 		/* keep ip packet alignment for alpha */
-		M_PREPEND(m, ETHER_ALIGN, M_DONTWAIT);
+		M_PREPEND(m, ETHER_ALIGN, M_NOWAIT);
 		fp = &xfer->send.hdr;
 		*(uint32_t *)&xfer->send.hdr = *(int32_t *)&fwe->pkt_hdr;
 		fp->mode.stream.len = m->m_pkthdr.len;
@@ -657,7 +657,7 @@ fwe_as_input(struct fw_xferq *xferq)
 		m = sxfer->mbuf;
 
 		/* insert new rbuf */
-		sxfer->mbuf = m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		sxfer->mbuf = m0 = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m0 != NULL) {
 			m0->m_len = m0->m_pkthdr.len = m0->m_ext.ext_size;
 			STAILQ_INSERT_TAIL(&xferq->stfree, sxfer, link);
diff --git a/sys/dev/firewire/if_fwip.c b/sys/dev/firewire/if_fwip.c
index e7c4a669e6e8..7010bc9c7ff3 100644
--- a/sys/dev/firewire/if_fwip.c
+++ b/sys/dev/firewire/if_fwip.c
@@ -333,7 +333,7 @@ fwip_init(void *arg)
 		STAILQ_INIT(&xferq->stdma);
 		xferq->stproc = NULL;
 		for (i = 0; i < xferq->bnchunk; i ++) {
-			m = m_getcl(M_WAIT, MT_DATA, M_PKTHDR);
+			m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
 			xferq->bulkxfer[i].mbuf = m;
 			m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
 			STAILQ_INSERT_TAIL(&xferq->stfree,
@@ -349,7 +349,7 @@ fwip_init(void *arg)
 			xfer = fw_xfer_alloc(M_FWIP);
 			if (xfer == NULL)
 				break;
-			m = m_getcl(M_WAIT, MT_DATA, M_PKTHDR);
+			m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
 			xfer->recv.payload = mtod(m, uint32_t *);
 			xfer->recv.pay_len = MCLBYTES;
 			xfer->hand = fwip_unicast_input;
@@ -657,7 +657,7 @@ fwip_async_output(struct fwip_softc *fwip, struct ifnet *ifp)
 			 */
 			uint32_t *p;
 
-			M_PREPEND(m, 2*sizeof(uint32_t), M_DONTWAIT);
+			M_PREPEND(m, 2*sizeof(uint32_t), M_NOWAIT);
 			p = mtod(m, uint32_t *);
 			fp->mode.stream.len = m->m_pkthdr.len;
 			fp->mode.stream.chtag = broadcast_channel;
@@ -778,7 +778,7 @@ fwip_stream_input(struct fw_xferq *xferq)
 		m = sxfer->mbuf;
 
 		/* insert new rbuf */
-		sxfer->mbuf = m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		sxfer->mbuf = m0 = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m0 != NULL) {
 			m0->m_len = m0->m_pkthdr.len = m0->m_ext.ext_size;
 			STAILQ_INSERT_TAIL(&xferq->stfree, sxfer, link);
@@ -871,7 +871,7 @@ fwip_unicast_input_recycle(struct fwip_softc *fwip, struct fw_xfer *xfer)
 	 * We have finished with a unicast xfer. Allocate a new
 	 * cluster and stick it on the back of the input queue.
 	 */
-	m = m_getcl(M_WAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
 	xfer->mbuf = m;
 	xfer->recv.payload = mtod(m, uint32_t *);
 	xfer->recv.pay_len = MCLBYTES;
diff --git a/sys/dev/fxp/if_fxp.c b/sys/dev/fxp/if_fxp.c
index 364df90ebcc5..ba63af734406 100644
--- a/sys/dev/fxp/if_fxp.c
+++ b/sys/dev/fxp/if_fxp.c
@@ -1447,7 +1447,7 @@ fxp_encap(struct fxp_softc *sc, struct mbuf **m_head)
 
 		if (M_WRITABLE(*m_head) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -1563,7 +1563,7 @@ fxp_encap(struct fxp_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->fxp_txmtag, txp->tx_map, *m_head,
 	    segs, &nseg, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, sc->maxtxseg);
+		m = m_collapse(*m_head, M_NOWAIT, sc->maxtxseg);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -2628,7 +2628,7 @@ fxp_new_rfabuf(struct fxp_softc *sc, struct fxp_rx *rxp)
 	bus_dmamap_t tmp_map;
 	int error;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 
diff --git a/sys/dev/gem/if_gem.c b/sys/dev/gem/if_gem.c
index d75e1ab8dc61..4aa9c6d34f1f 100644
--- a/sys/dev/gem/if_gem.c
+++ b/sys/dev/gem/if_gem.c
@@ -1120,7 +1120,7 @@ gem_load_txmbuf(struct gem_softc *sc, struct mbuf **m_head)
 	cflags = 0;
 	if (((*m_head)->m_pkthdr.csum_flags & sc->sc_csum_features) != 0) {
 		if (M_WRITABLE(*m_head) == 0) {
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			*m_head = m;
 			if (m == NULL)
@@ -1143,7 +1143,7 @@ gem_load_txmbuf(struct gem_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->sc_tdmatag, txs->txs_dmamap,
 	    *m_head, txsegs, &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, GEM_NTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, GEM_NTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -1663,7 +1663,7 @@ gem_add_rxbuf(struct gem_softc *sc, int idx)
 
 	GEM_LOCK_ASSERT(sc, MA_OWNED);
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
diff --git a/sys/dev/gxemul/ether/if_gx.c b/sys/dev/gxemul/ether/if_gx.c
index b98cc7ce3c01..321882f5fd8f 100644
--- a/sys/dev/gxemul/ether/if_gx.c
+++ b/sys/dev/gxemul/ether/if_gx.c
@@ -370,7 +370,7 @@ gx_rx_intr(void *arg)
 			continue;
 		}
 
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m == NULL) {
 			device_printf(sc->sc_dev, "no memory for receive mbuf.\n");
 			sc->sc_ifp->if_iqdrops++;
diff --git a/sys/dev/hatm/if_hatm_intr.c b/sys/dev/hatm/if_hatm_intr.c
index 35bbd57638bf..b6a53680eb15 100644
--- a/sys/dev/hatm/if_hatm_intr.c
+++ b/sys/dev/hatm/if_hatm_intr.c
@@ -330,7 +330,7 @@ he_intr_rbp(struct hatm_softc *sc, struct herbp *rbp, u_int large,
 
 		if (large) {
 			/* allocate the MBUF */
-			if ((m = m_getcl(M_DONTWAIT, MT_DATA,
+			if ((m = m_getcl(M_NOWAIT, MT_DATA,
 			    M_PKTHDR)) == NULL) {
 				if_printf(sc->ifp,
 				    "no mbuf clusters\n");
@@ -437,7 +437,7 @@ hatm_rx_buffer(struct hatm_softc *sc, u_int group, u_int handle)
 	DBG(sc, RX, ("RX group=%u handle=%x page=%u chunk=%u", group, handle,
 	    pageno, chunkno));
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 
 	if (group == 0) {
 		struct mbuf0_chunk *c0;
diff --git a/sys/dev/hatm/if_hatm_tx.c b/sys/dev/hatm/if_hatm_tx.c
index 868b5a3d43d6..455dbb4db327 100644
--- a/sys/dev/hatm/if_hatm_tx.c
+++ b/sys/dev/hatm/if_hatm_tx.c
@@ -466,7 +466,7 @@ hatm_start(struct ifnet *ifp)
 		if (error == EFBIG) {
 			/* try to defragment the packet */
 			sc->istats.defrag++;
-			m = m_defrag(m, M_DONTWAIT);
+			m = m_defrag(m, M_NOWAIT);
 			if (m == NULL) {
 				tpd->mbuf = NULL;
 				hatm_free_txmbuf(sc);
diff --git a/sys/dev/hifn/hifn7751.c b/sys/dev/hifn/hifn7751.c
index ecb12397cda9..c5c5af1b3fa4 100644
--- a/sys/dev/hifn/hifn7751.c
+++ b/sys/dev/hifn/hifn7751.c
@@ -1878,14 +1878,14 @@ hifn_crypto(
 			totlen = cmd->src_mapsize;
 			if (cmd->src_m->m_flags & M_PKTHDR) {
 				len = MHLEN;
-				MGETHDR(m0, M_DONTWAIT, MT_DATA);
-				if (m0 && !m_dup_pkthdr(m0, cmd->src_m, M_DONTWAIT)) {
+				MGETHDR(m0, M_NOWAIT, MT_DATA);
+				if (m0 && !m_dup_pkthdr(m0, cmd->src_m, M_NOWAIT)) {
 					m_free(m0);
 					m0 = NULL;
 				}
 			} else {
 				len = MLEN;
-				MGET(m0, M_DONTWAIT, MT_DATA);
+				MGET(m0, M_NOWAIT, MT_DATA);
 			}
 			if (m0 == NULL) {
 				hifnstats.hst_nomem_mbuf++;
@@ -1893,7 +1893,7 @@ hifn_crypto(
 				goto err_srcmap;
 			}
 			if (totlen >= MINCLSIZE) {
-				MCLGET(m0, M_DONTWAIT);
+				MCLGET(m0, M_NOWAIT);
 				if ((m0->m_flags & M_EXT) == 0) {
 					hifnstats.hst_nomem_mcl++;
 					err = sc->sc_cmdu ? ERESTART : ENOMEM;
@@ -1907,7 +1907,7 @@ hifn_crypto(
 			mlast = m0;
 
 			while (totlen > 0) {
-				MGET(m, M_DONTWAIT, MT_DATA);
+				MGET(m, M_NOWAIT, MT_DATA);
 				if (m == NULL) {
 					hifnstats.hst_nomem_mbuf++;
 					err = sc->sc_cmdu ? ERESTART : ENOMEM;
@@ -1916,7 +1916,7 @@ hifn_crypto(
 				}
 				len = MLEN;
 				if (totlen >= MINCLSIZE) {
-					MCLGET(m, M_DONTWAIT);
+					MCLGET(m, M_NOWAIT);
 					if ((m->m_flags & M_EXT) == 0) {
 						hifnstats.hst_nomem_mcl++;
 						err = sc->sc_cmdu ? ERESTART : ENOMEM;
diff --git a/sys/dev/hme/if_hme.c b/sys/dev/hme/if_hme.c
index 63d27d145449..9f310ee4f11e 100644
--- a/sys/dev/hme/if_hme.c
+++ b/sys/dev/hme/if_hme.c
@@ -564,7 +564,7 @@ hme_add_rxbuf(struct hme_softc *sc, unsigned int ri, int keepold)
 		hme_discard_rxbuf(sc, ri);
 		return (0);
 	}
-	if ((m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR)) == NULL)
+	if ((m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR)) == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
 	b = mtod(m, uintptr_t);
@@ -951,7 +951,7 @@ hme_load_txmbuf(struct hme_softc *sc, struct mbuf **m0)
 	cflags = 0;
 	if (((*m0)->m_pkthdr.csum_flags & sc->sc_csum_features) != 0) {
 		if (M_WRITABLE(*m0) == 0) {
-			m = m_dup(*m0, M_DONTWAIT);
+			m = m_dup(*m0, M_NOWAIT);
 			m_freem(*m0);
 			*m0 = m;
 			if (m == NULL)
@@ -974,7 +974,7 @@ hme_load_txmbuf(struct hme_softc *sc, struct mbuf **m0)
 	error = bus_dmamap_load_mbuf_sg(sc->sc_tdmatag, htx->htx_dmamap,
 	    *m0, segs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m0, M_DONTWAIT, HME_NTXSEGS);
+		m = m_collapse(*m0, M_NOWAIT, HME_NTXSEGS);
 		if (m == NULL) {
 			m_freem(*m0);
 			*m0 = NULL;
diff --git a/sys/dev/ie/if_ie.c b/sys/dev/ie/if_ie.c
index fb0d9871dc41..e945a060c5e5 100644
--- a/sys/dev/ie/if_ie.c
+++ b/sys/dev/ie/if_ie.c
@@ -698,7 +698,7 @@ ieget(struct ie_softc *sc, struct mbuf **mp)
 		return (-1);
 	}
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (!m) {
 		ie_drop_packet_buffer(sc);
 		/* XXXX if_ierrors++; */
@@ -727,7 +727,7 @@ ieget(struct ie_softc *sc, struct mbuf **mp)
 		 * single mbuf which may or may not be big enough. Got that?
 		 */
 		if (top) {
-			MGET(m, M_DONTWAIT, MT_DATA);
+			MGET(m, M_NOWAIT, MT_DATA);
 			if (!m) {
 				m_freem(top);
 				ie_drop_packet_buffer(sc);
@@ -736,7 +736,7 @@ ieget(struct ie_softc *sc, struct mbuf **mp)
 			m->m_len = MLEN;
 		}
 		if (resid >= MINCLSIZE) {
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if (m->m_flags & M_EXT)
 				m->m_len = min(resid, MCLBYTES);
 		} else {
diff --git a/sys/dev/if_ndis/if_ndis.c b/sys/dev/if_ndis/if_ndis.c
index 10fc01885149..a62b9138abc0 100644
--- a/sys/dev/if_ndis/if_ndis.c
+++ b/sys/dev/if_ndis/if_ndis.c
@@ -1174,7 +1174,7 @@ ndis_rxeof_eth(adapter, ctx, addr, hdr, hdrlen, lookahead, lookaheadlen, pktlen)
 
 	block = adapter;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return;
 
@@ -1418,7 +1418,7 @@ ndis_rxeof(adapter, packets, pktcnt)
 		} else {
 #ifdef notdef
 			if (p->np_oob.npo_status == NDIS_STATUS_RESOURCES) {
-				m = m_dup(m0, M_DONTWAIT);
+				m = m_dup(m0, M_NOWAIT);
 				/*
 				 * NOTE: we want to destroy the mbuf here, but
 				 * we don't actually want to return it to the
@@ -1436,7 +1436,7 @@ ndis_rxeof(adapter, packets, pktcnt)
 			} else
 				p->np_oob.npo_status = NDIS_STATUS_PENDING;
 #endif
-			m = m_dup(m0, M_DONTWAIT);
+			m = m_dup(m0, M_NOWAIT);
 			if (p->np_oob.npo_status == NDIS_STATUS_RESOURCES)
 				p->np_refcnt++;
 			else
diff --git a/sys/dev/ipw/if_ipw.c b/sys/dev/ipw/if_ipw.c
index 01e30127ec49..28fa0fd10af5 100644
--- a/sys/dev/ipw/if_ipw.c
+++ b/sys/dev/ipw/if_ipw.c
@@ -709,7 +709,7 @@ ipw_dma_alloc(struct ipw_softc *sc)
 		sbuf = &sc->rx_sbuf_list[i];
 		sbd->bd = &sc->rbd_list[i];
 
-		sbuf->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		sbuf->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (sbuf->m == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not allocate rx mbuf\n");
@@ -1207,7 +1207,7 @@ ipw_rx_data_intr(struct ipw_softc *sc, struct ipw_status *status,
 	 * drop the received packet and reuse the old mbuf. In the unlikely
 	 * case that the old mbuf can't be reloaded either, explicitly panic.
 	 */
-	mnew = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (mnew == NULL) {
 		ifp->if_ierrors++;
 		return;
@@ -1651,7 +1651,7 @@ ipw_tx_start(struct ifnet *ifp, struct mbuf *m0, struct ieee80211_node *ni)
 		return error;
 	}
 	if (error != 0) {
-		mnew = m_defrag(m0, M_DONTWAIT);
+		mnew = m_defrag(m0, M_NOWAIT);
 		if (mnew == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
diff --git a/sys/dev/iwi/if_iwi.c b/sys/dev/iwi/if_iwi.c
index 8571d6107e47..fe1c6436dca8 100644
--- a/sys/dev/iwi/if_iwi.c
+++ b/sys/dev/iwi/if_iwi.c
@@ -788,7 +788,7 @@ iwi_alloc_rx_ring(struct iwi_softc *sc, struct iwi_rx_ring *ring, int count)
 			goto fail;
 		}
 
-		data->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		data->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (data->m == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not allocate rx mbuf\n");
@@ -1236,7 +1236,7 @@ iwi_frame_intr(struct iwi_softc *sc, struct iwi_rx_data *data, int i,
 	 * drop the received packet and reuse the old mbuf. In the unlikely
 	 * case that the old mbuf can't be reloaded either, explicitly panic.
 	 */
-	mnew = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (mnew == NULL) {
 		ifp->if_ierrors++;
 		return;
@@ -1884,7 +1884,7 @@ iwi_tx_start(struct ifnet *ifp, struct mbuf *m0, struct ieee80211_node *ni,
 		return error;
 	}
 	if (error != 0) {
-		mnew = m_defrag(m0, M_DONTWAIT);
+		mnew = m_defrag(m0, M_NOWAIT);
 		if (mnew == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
index 6c292d7382a7..b6b523a7edd0 100644
--- a/sys/dev/iwn/if_iwn.c
+++ b/sys/dev/iwn/if_iwn.c
@@ -1377,7 +1377,7 @@ iwn_alloc_rx_ring(struct iwn_softc *sc, struct iwn_rx_ring *ring)
 			goto fail;
 		}
 
-		data->m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+		data->m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 		    IWN_RBUF_SIZE);
 		if (data->m == NULL) {
 			device_printf(sc->sc_dev,
@@ -2334,7 +2334,7 @@ iwn_rx_done(struct iwn_softc *sc, struct iwn_rx_desc *desc,
 		return;
 	}
 
-	m1 = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, IWN_RBUF_SIZE);
+	m1 = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, IWN_RBUF_SIZE);
 	if (m1 == NULL) {
 		DPRINTF(sc, IWN_DEBUG_ANY, "%s: no mbuf to restock ring\n",
 		    __func__);
@@ -3539,7 +3539,7 @@ iwn_tx_data(struct iwn_softc *sc, struct mbuf *m, struct ieee80211_node *ni)
 			return error;
 		}
 		/* Too many DMA segments, linearize mbuf. */
-		m1 = m_collapse(m, M_DONTWAIT, IWN_MAX_SCATTER);
+		m1 = m_collapse(m, M_NOWAIT, IWN_MAX_SCATTER);
 		if (m1 == NULL) {
 			device_printf(sc->sc_dev,
 			    "%s: could not defrag mbuf\n", __func__);
@@ -3743,7 +3743,7 @@ iwn_tx_data_raw(struct iwn_softc *sc, struct mbuf *m,
 			return error;
 		}
 		/* Too many DMA segments, linearize mbuf. */
-		m1 = m_collapse(m, M_DONTWAIT, IWN_MAX_SCATTER);
+		m1 = m_collapse(m, M_NOWAIT, IWN_MAX_SCATTER);
 		if (m1 == NULL) {
 			device_printf(sc->sc_dev,
 			    "%s: could not defrag mbuf\n", __func__);
@@ -3976,7 +3976,7 @@ iwn_cmd(struct iwn_softc *sc, int code, const void *buf, int size, int async)
 		/* Command is too large to fit in a descriptor. */
 		if (totlen > MCLBYTES)
 			return EINVAL;
-		m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
+		m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
 		if (m == NULL)
 			return ENOMEM;
 		cmd = mtod(m, struct iwn_tx_cmd *);
diff --git a/sys/dev/ixgb/if_ixgb.c b/sys/dev/ixgb/if_ixgb.c
index 544e8e370cae..e9acae088709 100644
--- a/sys/dev/ixgb/if_ixgb.c
+++ b/sys/dev/ixgb/if_ixgb.c
@@ -1790,7 +1790,7 @@ ixgb_get_buf(int i, struct adapter * adapter,
 
 	if (mp == NULL) {
 
-		mp = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		mp = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 
 		if (mp == NULL) {
 			adapter->mbuf_alloc_failed++;
diff --git a/sys/dev/ixgbe/ixgbe.c b/sys/dev/ixgbe/ixgbe.c
index 27d3d0ae06d4..f84644011077 100644
--- a/sys/dev/ixgbe/ixgbe.c
+++ b/sys/dev/ixgbe/ixgbe.c
@@ -3707,7 +3707,7 @@ ixgbe_refresh_mbufs(struct rx_ring *rxr, int limit)
 	while (j != limit) {
 		rxbuf = &rxr->rx_buffers[i];
 		if (rxbuf->buf == NULL) {
-			mp = m_getjcl(M_DONTWAIT, MT_DATA,
+			mp = m_getjcl(M_NOWAIT, MT_DATA,
 			    M_PKTHDR, rxr->mbuf_sz);
 			if (mp == NULL)
 				goto update;
diff --git a/sys/dev/ixgbe/ixv.c b/sys/dev/ixgbe/ixv.c
index 37f602b6b196..b9aff8000989 100644
--- a/sys/dev/ixgbe/ixv.c
+++ b/sys/dev/ixgbe/ixv.c
@@ -1235,7 +1235,7 @@ ixv_xmit(struct tx_ring *txr, struct mbuf **m_headp)
 	if (error == EFBIG) {
 		struct mbuf *m;
 
-		m = m_defrag(*m_headp, M_DONTWAIT);
+		m = m_defrag(*m_headp, M_NOWAIT);
 		if (m == NULL) {
 			adapter->mbuf_defrag_failed++;
 			m_freem(*m_headp);
@@ -2723,7 +2723,7 @@ ixv_refresh_mbufs(struct rx_ring *rxr, int limit)
 	while (j != limit) {
 		rxbuf = &rxr->rx_buffers[i];
 		if ((rxbuf->m_head == NULL) && (rxr->hdr_split)) {
-			mh = m_gethdr(M_DONTWAIT, MT_DATA);
+			mh = m_gethdr(M_NOWAIT, MT_DATA);
 			if (mh == NULL)
 				goto update;
 			mh->m_pkthdr.len = mh->m_len = MHLEN;
@@ -2747,7 +2747,7 @@ ixv_refresh_mbufs(struct rx_ring *rxr, int limit)
 		}
 
 		if (rxbuf->m_pack == NULL) {
-			mp = m_getjcl(M_DONTWAIT, MT_DATA,
+			mp = m_getjcl(M_NOWAIT, MT_DATA,
 			    M_PKTHDR, adapter->rx_mbuf_sz);
 			if (mp == NULL)
 				goto update;
diff --git a/sys/dev/jme/if_jme.c b/sys/dev/jme/if_jme.c
index 13270b78d40c..832acef0e5c0 100644
--- a/sys/dev/jme/if_jme.c
+++ b/sys/dev/jme/if_jme.c
@@ -1712,7 +1712,7 @@ jme_encap(struct jme_softc *sc, struct mbuf **m_head)
 
 		if (M_WRITABLE(*m_head) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -1774,7 +1774,7 @@ jme_encap(struct jme_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->jme_cdata.jme_tx_tag,
 	    txd->tx_dmamap, *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, JME_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, JME_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -3181,7 +3181,7 @@ jme_newbuf(struct jme_softc *sc, struct jme_rxdesc *rxd)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	/*
diff --git a/sys/dev/le/lance.c b/sys/dev/le/lance.c
index 8700aa2cd436..e2cc30e23716 100644
--- a/sys/dev/le/lance.c
+++ b/sys/dev/le/lance.c
@@ -394,7 +394,7 @@ lance_get(struct lance_softc *sc, int boff, int totlen)
 		return (NULL);
 	}
 
-	MGETHDR(m0, M_DONTWAIT, MT_DATA);
+	MGETHDR(m0, M_NOWAIT, MT_DATA);
 	if (m0 == NULL)
 		return (NULL);
 	m0->m_pkthdr.rcvif = ifp;
@@ -404,7 +404,7 @@ lance_get(struct lance_softc *sc, int boff, int totlen)
 
 	while (totlen > 0) {
 		if (totlen >= MINCLSIZE) {
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if ((m->m_flags & M_EXT) == 0)
 				goto bad;
 			len = MCLBYTES;
@@ -423,7 +423,7 @@ lance_get(struct lance_softc *sc, int boff, int totlen)
 
 		totlen -= len;
 		if (totlen > 0) {
-			MGET(newm, M_DONTWAIT, MT_DATA);
+			MGET(newm, M_NOWAIT, MT_DATA);
 			if (newm == 0)
 				goto bad;
 			len = MLEN;
diff --git a/sys/dev/lge/if_lge.c b/sys/dev/lge/if_lge.c
index 09ceea12d0e1..d9948672d306 100644
--- a/sys/dev/lge/if_lge.c
+++ b/sys/dev/lge/if_lge.c
@@ -691,7 +691,7 @@ lge_newbuf(sc, c, m)
 	caddr_t			*buf = NULL;
 
 	if (m == NULL) {
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL) {
 			device_printf(sc->lge_dev, "no memory for rx list "
 			    "-- packet dropped!\n");
diff --git a/sys/dev/lmc/if_lmc.c b/sys/dev/lmc/if_lmc.c
index 62f6017af597..9d1ec8cdc847 100644
--- a/sys/dev/lmc/if_lmc.c
+++ b/sys/dev/lmc/if_lmc.c
@@ -2916,7 +2916,7 @@ rxintr_cleanup(softc_t *sc)
     /* Optimization: copy a small pkt into a small mbuf. */
     if (first_mbuf->m_pkthdr.len <= COPY_BREAK)
       {
-      MGETHDR(new_mbuf, M_DONTWAIT, MT_DATA);
+      MGETHDR(new_mbuf, M_NOWAIT, MT_DATA);
       if (new_mbuf != NULL)
         {
         new_mbuf->m_pkthdr.rcvif = first_mbuf->m_pkthdr.rcvif;
@@ -3016,7 +3016,7 @@ rxintr_setup(softc_t *sc)
     return 0;  /* ring is full; nothing to do */
 
   /* Allocate a small mbuf and attach an mbuf cluster. */
-  MGETHDR(m, M_DONTWAIT, MT_DATA);
+  MGETHDR(m, M_NOWAIT, MT_DATA);
   if (m == NULL)
     {
     sc->status.cntrs.rxdma++;
@@ -3024,7 +3024,7 @@ rxintr_setup(softc_t *sc)
       printf("%s: rxintr_setup: MGETHDR() failed\n", NAME_UNIT);
     return 0;
     }
-  MCLGET(m, M_DONTWAIT);
+  MCLGET(m, M_NOWAIT);
   if ((m->m_flags & M_EXT) == 0)
     {
     m_freem(m);
diff --git a/sys/dev/malo/if_malo.c b/sys/dev/malo/if_malo.c
index 7305d12ddc7d..9f298de0d7ad 100644
--- a/sys/dev/malo/if_malo.c
+++ b/sys/dev/malo/if_malo.c
@@ -854,7 +854,7 @@ malo_tx_dmasetup(struct malo_softc *sc, struct malo_txbuf *bf, struct mbuf *m0)
 	 */
 	if (error == EFBIG) {		/* too many desc's, linearize */
 		sc->malo_stats.mst_tx_linear++;
-		m = m_defrag(m0, M_DONTWAIT);
+		m = m_defrag(m0, M_NOWAIT);
 		if (m == NULL) {
 			m_freem(m0);
 			sc->malo_stats.mst_tx_nombuf++;
@@ -1396,7 +1396,7 @@ malo_getrxmbuf(struct malo_softc *sc, struct malo_rxbuf *bf)
 	int error;
 
 	/* XXX don't need mbuf, just dma buffer */
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
 	if (m == NULL) {
 		sc->malo_stats.mst_rx_nombuf++;	/* XXX */
 		return NULL;
diff --git a/sys/dev/mge/if_mge.c b/sys/dev/mge/if_mge.c
index a76fee435503..3195b239988e 100644
--- a/sys/dev/mge/if_mge.c
+++ b/sys/dev/mge/if_mge.c
@@ -389,7 +389,7 @@ mge_new_rxbuf(bus_dma_tag_t tag, bus_dmamap_t map, struct mbuf **mbufp,
 
 	KASSERT(mbufp != NULL, ("NULL mbuf pointer!"));
 
-	new_mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	new_mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (new_mbuf == NULL)
 		return (ENOBUFS);
 	new_mbuf->m_len = new_mbuf->m_pkthdr.len = new_mbuf->m_ext.ext_size;
@@ -1549,7 +1549,7 @@ mge_start_locked(struct ifnet *ifp)
 		if (m0 == NULL)
 			break;
 
-		mtmp = m_defrag(m0, M_DONTWAIT);
+		mtmp = m_defrag(m0, M_NOWAIT);
 		if (mtmp)
 			m0 = mtmp;
 
diff --git a/sys/dev/mn/if_mn.c b/sys/dev/mn/if_mn.c
index 07c2a98db6e4..48fc3dc0a9b6 100644
--- a/sys/dev/mn/if_mn.c
+++ b/sys/dev/mn/if_mn.c
@@ -693,7 +693,7 @@ ngmn_connect(hook_p hook)
 	/* Setup a transmit chain with one descriptor */
 	/* XXX: we actually send a 1 byte packet */
 	dp = mn_alloc_desc();
-	MGETHDR(m, M_WAIT, MT_DATA);
+	MGETHDR(m, M_WAITOK, MT_DATA);
 	m->m_pkthdr.len = 0;
 	dp->m = m;
 	dp->flags = 0xc0000000 + (1 << 16);
@@ -708,8 +708,8 @@ ngmn_connect(hook_p hook)
 
 	dp = mn_alloc_desc();
 	m = NULL;
-	MGETHDR(m, M_WAIT, MT_DATA);
-	MCLGET(m, M_WAIT);
+	MGETHDR(m, M_WAITOK, MT_DATA);
+	MCLGET(m, M_WAITOK);
 	dp->m = m;
 	dp->data = vtophys(m->m_data);
 	dp->flags = 0x40000000;
@@ -722,8 +722,8 @@ ngmn_connect(hook_p hook)
 		dp2 = dp;
 		dp = mn_alloc_desc();
 		m = NULL;
-		MGETHDR(m, M_WAIT, MT_DATA);
-		MCLGET(m, M_WAIT);
+		MGETHDR(m, M_WAITOK, MT_DATA);
+		MCLGET(m, M_WAITOK);
 		dp->m = m;
 		dp->data = vtophys(m->m_data);
 		dp->flags = 0x00000000;
@@ -1160,12 +1160,12 @@ mn_rx_intr(struct mn_softc *sc, u_int32_t vector)
 
 		/* Replenish desc + mbuf supplies */
 		if (!m) {
-			MGETHDR(m, M_DONTWAIT, MT_DATA);
+			MGETHDR(m, M_NOWAIT, MT_DATA);
 			if (m == NULL) {
 				mn_free_desc(dp);
 				return; /* ENOBUFS */
 			}
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if((m->m_flags & M_EXT) == 0) {
 				mn_free_desc(dp);
 				m_freem(m);
diff --git a/sys/dev/msk/if_msk.c b/sys/dev/msk/if_msk.c
index 93292e52e760..d0ca808c8ef3 100644
--- a/sys/dev/msk/if_msk.c
+++ b/sys/dev/msk/if_msk.c
@@ -897,7 +897,7 @@ msk_newbuf(struct msk_if_softc *sc_if, int idx)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 
@@ -955,7 +955,7 @@ msk_jumbo_newbuf(struct msk_if_softc *sc_if, int idx)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
 	if (m == NULL)
 		return (ENOBUFS);
 	if ((m->m_flags & M_EXT) == 0) {
@@ -2653,7 +2653,7 @@ msk_encap(struct msk_if_softc *sc_if, struct mbuf **m_head)
 
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -2732,7 +2732,7 @@ msk_encap(struct msk_if_softc *sc_if, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc_if->msk_cdata.msk_tx_tag, map,
 	    *m_head, txsegs, &nseg, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, MSK_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, MSK_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/mwl/if_mwl.c b/sys/dev/mwl/if_mwl.c
index 79393c8d8f16..1d2b6e38b011 100644
--- a/sys/dev/mwl/if_mwl.c
+++ b/sys/dev/mwl/if_mwl.c
@@ -2810,7 +2810,7 @@ mwl_rx_proc(void *arg, int npending)
 		 * be a net loss.  The tradeoff might be system
 		 * dependent (cache architecture is important).
 		 */
-		MGETHDR(m, M_DONTWAIT, MT_DATA);
+		MGETHDR(m, M_NOWAIT, MT_DATA);
 		if (m == NULL) {
 			DPRINTF(sc, MWL_DEBUG_ANY,
 			    "%s: no rx mbuf\n", __func__);
@@ -3087,9 +3087,9 @@ mwl_tx_dmasetup(struct mwl_softc *sc, struct mwl_txbuf *bf, struct mbuf *m0)
 	if (error == EFBIG) {		/* too many desc's, linearize */
 		sc->sc_stats.mst_tx_linear++;
 #if MWL_TXDESC > 1
-		m = m_collapse(m0, M_DONTWAIT, MWL_TXDESC);
+		m = m_collapse(m0, M_NOWAIT, MWL_TXDESC);
 #else
-		m = m_defrag(m0, M_DONTWAIT);
+		m = m_defrag(m0, M_NOWAIT);
 #endif
 		if (m == NULL) {
 			m_freem(m0);
diff --git a/sys/dev/mxge/if_mxge.c b/sys/dev/mxge/if_mxge.c
index c8dea6b06a63..c04e0df2bdbb 100644
--- a/sys/dev/mxge/if_mxge.c
+++ b/sys/dev/mxge/if_mxge.c
@@ -2004,7 +2004,7 @@ mxge_vlan_tag_insert(struct mbuf *m)
 {
 	struct ether_vlan_header *evl;
 
-	M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
+	M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
 	if (__predict_false(m == NULL))
 		return NULL;
 	if (m->m_len < sizeof(*evl)) {
@@ -2376,7 +2376,7 @@ mxge_get_buf_small(struct mxge_slice_state *ss, bus_dmamap_t map, int idx)
 	mxge_rx_ring_t *rx = &ss->rx_small;
 	int cnt, err;
 
-	m = m_gethdr(M_DONTWAIT, MT_DATA);
+	m = m_gethdr(M_NOWAIT, MT_DATA);
 	if (m == NULL) {
 		rx->alloc_fail++;
 		err = ENOBUFS;
@@ -2409,7 +2409,7 @@ mxge_get_buf_big(struct mxge_slice_state *ss, bus_dmamap_t map, int idx)
 	mxge_rx_ring_t *rx = &ss->rx_big;
 	int cnt, err, i;
 
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, rx->cl_size);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, rx->cl_size);
 	if (m == NULL) {
 		rx->alloc_fail++;
 		err = ENOBUFS;
diff --git a/sys/dev/my/if_my.c b/sys/dev/my/if_my.c
index c7c0ad488c79..964841242fc0 100644
--- a/sys/dev/my/if_my.c
+++ b/sys/dev/my/if_my.c
@@ -1085,13 +1085,13 @@ my_newbuf(struct my_softc * sc, struct my_chain_onefrag * c)
 	struct mbuf    *m_new = NULL;
 
 	MY_LOCK_ASSERT(sc);
-	MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+	MGETHDR(m_new, M_NOWAIT, MT_DATA);
 	if (m_new == NULL) {
 		device_printf(sc->my_dev,
 		    "no memory for rx list -- packet dropped!\n");
 		return (ENOBUFS);
 	}
-	MCLGET(m_new, M_DONTWAIT);
+	MCLGET(m_new, M_NOWAIT);
 	if (!(m_new->m_flags & M_EXT)) {
 		device_printf(sc->my_dev,
 		    "no memory for rx list -- packet dropped!\n");
@@ -1352,13 +1352,13 @@ my_encap(struct my_softc * sc, struct my_chain * c, struct mbuf * m_head)
 	 * chain.
 	 */
 	m = m_head;
-	MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+	MGETHDR(m_new, M_NOWAIT, MT_DATA);
 	if (m_new == NULL) {
 		device_printf(sc->my_dev, "no memory for tx list");
 		return (1);
 	}
 	if (m_head->m_pkthdr.len > MHLEN) {
-		MCLGET(m_new, M_DONTWAIT);
+		MCLGET(m_new, M_NOWAIT);
 		if (!(m_new->m_flags & M_EXT)) {
 			m_freem(m_new);
 			device_printf(sc->my_dev, "no memory for tx list");
diff --git a/sys/dev/nfe/if_nfe.c b/sys/dev/nfe/if_nfe.c
index fe072f33f7fc..13099e9fa9e9 100644
--- a/sys/dev/nfe/if_nfe.c
+++ b/sys/dev/nfe/if_nfe.c
@@ -1975,7 +1975,7 @@ nfe_newbuf(struct nfe_softc *sc, int idx)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 
@@ -2031,7 +2031,7 @@ nfe_jnewbuf(struct nfe_softc *sc, int idx)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
 	if (m == NULL)
 		return (ENOBUFS);
 	if ((m->m_flags & M_EXT) == 0) {
@@ -2400,7 +2400,7 @@ nfe_encap(struct nfe_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->txq.tx_data_tag, map, *m_head, segs,
 	    &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, NFE_MAX_SCATTER);
+		m = m_collapse(*m_head, M_NOWAIT, NFE_MAX_SCATTER);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/nge/if_nge.c b/sys/dev/nge/if_nge.c
index 7cf3eea8cd17..6f680c38ea24 100644
--- a/sys/dev/nge/if_nge.c
+++ b/sys/dev/nge/if_nge.c
@@ -1381,7 +1381,7 @@ nge_newbuf(struct nge_softc *sc, int idx)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1894,7 +1894,7 @@ nge_encap(struct nge_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->nge_cdata.nge_tx_tag, map,
 	    *m_head, txsegs, &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, NGE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, NGE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/nve/if_nve.c b/sys/dev/nve/if_nve.c
index fe26666d8144..839cfb6ad748 100644
--- a/sys/dev/nve/if_nve.c
+++ b/sys/dev/nve/if_nve.c
@@ -764,7 +764,7 @@ nve_init_rings(struct nve_softc *sc)
 		struct nve_rx_desc *desc = sc->rx_desc + i;
 		struct nve_map_buffer *buf = &desc->buf;
 
-		buf->mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		buf->mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (buf->mbuf == NULL) {
 			device_printf(sc->dev, "couldn't allocate mbuf\n");
 			nve_free_rings(sc);
@@ -918,7 +918,7 @@ nve_ifstart_locked(struct ifnet *ifp)
 		 * cluster
 		 */
 		if (error) {
-			m = m_defrag(m0, M_DONTWAIT);
+			m = m_defrag(m0, M_NOWAIT);
 			if (m == NULL) {
 				m_freem(m0);
 				sc->tx_errors++;
@@ -1480,7 +1480,7 @@ nve_osallocrxbuf(PNV_VOID ctx, PMEMORY_BLOCK mem, PNV_VOID *id)
 	buf = &desc->buf;
 
 	if (buf->mbuf == NULL) {
-		buf->mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		buf->mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (buf->mbuf == NULL) {
 			device_printf(sc->dev, "failed to allocate memory\n");
 			goto fail;
diff --git a/sys/dev/nxge/if_nxge.c b/sys/dev/nxge/if_nxge.c
index 8c3ca5d29062..c7dbeb620055 100644
--- a/sys/dev/nxge/if_nxge.c
+++ b/sys/dev/nxge/if_nxge.c
@@ -3024,7 +3024,7 @@ xge_send_locked(struct ifnet *ifnetp, int qindex)
 	    }
 
 	    if(count >= max_fragments) {
-	        m_buf = m_defrag(m_head, M_DONTWAIT);
+	        m_buf = m_defrag(m_head, M_NOWAIT);
 	        if(m_buf != NULL) m_head = m_buf;
 	        XGE_DRV_STATS(tx_defrag);
 	    }
@@ -3132,7 +3132,7 @@ xge_get_buf(xge_hal_dtr_h dtrh, xge_rx_priv_t *rxd_priv,
 
 	if(buffer_size <= MCLBYTES) {
 	    cluster_size = MCLBYTES;
-	    mp = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	    mp = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	}
 	else {
 	    cluster_size = MJUMPAGESIZE;
@@ -3140,7 +3140,7 @@ xge_get_buf(xge_hal_dtr_h dtrh, xge_rx_priv_t *rxd_priv,
 	        (buffer_size > MJUMPAGESIZE)) {
 	        cluster_size = MJUM9BYTES;
 	    }
-	    mp = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, cluster_size);
+	    mp = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, cluster_size);
 	}
 	if(!mp) {
 	    xge_trace(XGE_ERR, "Out of memory to allocate mbuf");
diff --git a/sys/dev/oce/oce_if.c b/sys/dev/oce/oce_if.c
index 79ba41045163..7d15fcc094e8 100644
--- a/sys/dev/oce/oce_if.c
+++ b/sys/dev/oce/oce_if.c
@@ -902,7 +902,7 @@ oce_tx(POCE_SOFTC sc, struct mbuf **mpp, int wq_index)
 
 	} else if (rc == EFBIG)	{
 		if (retry_cnt == 0) {
-			m_temp = m_defrag(m, M_DONTWAIT);
+			m_temp = m_defrag(m, M_NOWAIT);
 			if (m_temp == NULL)
 				goto free_ret;
 			m = m_temp;
@@ -995,7 +995,7 @@ oce_tso_setup(POCE_SOFTC sc, struct mbuf **mpp)
 	m = *mpp;
 
 	if (M_WRITABLE(m) == 0) {
-		m = m_dup(*mpp, M_DONTWAIT);
+		m = m_dup(*mpp, M_NOWAIT);
 		if (!m)
 			return NULL;
 		m_freem(*mpp);
@@ -1481,7 +1481,7 @@ oce_alloc_rx_bufs(struct oce_rq *rq, int count)
 			break;	/* no more room */
 
 		pd = &rq->pckts[rq->packets_in];
-		pd->mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		pd->mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (pd->mbuf == NULL)
 			break;
 
diff --git a/sys/dev/patm/if_patm_intr.c b/sys/dev/patm/if_patm_intr.c
index 79cb248966ba..12ef9958c1da 100644
--- a/sys/dev/patm/if_patm_intr.c
+++ b/sys/dev/patm/if_patm_intr.c
@@ -324,7 +324,7 @@ patm_lmbuf_alloc(struct patm_softc *sc)
 	struct mbuf *m;
 	struct lmbuf *b;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (NULL);
 	m->m_data += LMBUF_OFFSET;
diff --git a/sys/dev/patm/if_patm_rx.c b/sys/dev/patm/if_patm_rx.c
index 024d8ef1fb76..f739b9cfa4a4 100644
--- a/sys/dev/patm/if_patm_rx.c
+++ b/sys/dev/patm/if_patm_rx.c
@@ -396,9 +396,9 @@ patm_rcv_mbuf(struct patm_softc *sc, void *buf, u_int h, int hdr)
 		return ((struct mbuf *)buf);
 
 	if (hdr)
-		MGETHDR(m, M_DONTWAIT, MT_DATA);
+		MGETHDR(m, M_NOWAIT, MT_DATA);
 	else
-		MGET(m, M_DONTWAIT, MT_DATA);
+		MGET(m, M_NOWAIT, MT_DATA);
 	if (m == NULL) {
 		patm_rcv_free(sc, buf, h);
 		return (NULL);
@@ -458,7 +458,7 @@ patm_rx_raw(struct patm_softc *sc, u_char *cell)
 		}
 	}
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL) {
 		sc->stats.raw_no_buf++;
 		return;
diff --git a/sys/dev/patm/if_patm_tx.c b/sys/dev/patm/if_patm_tx.c
index cb40aa530fc5..81a1efceb71b 100644
--- a/sys/dev/patm/if_patm_tx.c
+++ b/sys/dev/patm/if_patm_tx.c
@@ -438,7 +438,7 @@ patm_tx_pad(struct patm_softc *sc, struct mbuf *m0)
 			return (m0);
 		}
 	}
-	MGET(m, M_DONTWAIT, MT_DATA);
+	MGET(m, M_NOWAIT, MT_DATA);
 	if (m == 0) {
 		m_freem(m0);
 		sc->ifp->if_oerrors++;
@@ -532,7 +532,7 @@ patm_launch(struct patm_softc *sc, struct patm_scd *scd)
 		error = bus_dmamap_load_mbuf(sc->tx_tag, map->map, m,
 		    patm_load_txbuf, &a, BUS_DMA_NOWAIT);
 		if (error == EFBIG) {
-			if ((m = m_defrag(m, M_DONTWAIT)) == NULL) {
+			if ((m = m_defrag(m, M_NOWAIT)) == NULL) {
 				sc->ifp->if_oerrors++;
 				continue;
 			}
diff --git a/sys/dev/pcn/if_pcn.c b/sys/dev/pcn/if_pcn.c
index 4aaabc055752..a9cff3c22fdb 100644
--- a/sys/dev/pcn/if_pcn.c
+++ b/sys/dev/pcn/if_pcn.c
@@ -798,11 +798,11 @@ pcn_newbuf(sc, idx, m)
 	c = &sc->pcn_ldata->pcn_rx_list[idx];
 
 	if (m == NULL) {
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL)
 			return(ENOBUFS);
 
-		MCLGET(m_new, M_DONTWAIT);
+		MCLGET(m_new, M_NOWAIT);
 		if (!(m_new->m_flags & M_EXT)) {
 			m_freem(m_new);
 			return(ENOBUFS);
diff --git a/sys/dev/pdq/pdq_freebsd.h b/sys/dev/pdq/pdq_freebsd.h
index 6efd6849b4e7..02bb9ca5ab6f 100644
--- a/sys/dev/pdq/pdq_freebsd.h
+++ b/sys/dev/pdq/pdq_freebsd.h
@@ -187,9 +187,9 @@ typedef struct _pdq_os_ctx_t {
 
 #define	PDQ_OS_DATABUF_ALLOC(pdq, b) do { \
     PDQ_OS_DATABUF_T *x_m0; \
-    MGETHDR(x_m0, M_DONTWAIT, MT_DATA); \
+    MGETHDR(x_m0, M_NOWAIT, MT_DATA); \
     if (x_m0 != NULL) { \
-	MCLGET(x_m0, M_DONTWAIT);	\
+	MCLGET(x_m0, M_NOWAIT);	\
 	if ((x_m0->m_flags & M_EXT) == 0) { \
 	    m_free(x_m0); \
 	    (b) = NULL; \
diff --git a/sys/dev/pdq/pdq_ifsubr.c b/sys/dev/pdq/pdq_ifsubr.c
index 4df00825fe4c..00e42b0edec7 100644
--- a/sys/dev/pdq/pdq_ifsubr.c
+++ b/sys/dev/pdq/pdq_ifsubr.c
@@ -742,12 +742,12 @@ pdq_os_databuf_alloc(
     struct mbuf *m;
     bus_dmamap_t map;
 
-    MGETHDR(m, M_DONTWAIT, MT_DATA);
+    MGETHDR(m, M_NOWAIT, MT_DATA);
     if (m == NULL) {
 	printf("%s: can't alloc small buf\n", sc->sc_dev.dv_xname);
 	return NULL;
     }
-    MCLGET(m, M_DONTWAIT);
+    MCLGET(m, M_NOWAIT);
     if ((m->m_flags & M_EXT) == 0) {
 	printf("%s: can't alloc cluster\n", sc->sc_dev.dv_xname);
         m_free(m);
diff --git a/sys/dev/pdq/pdqvar.h b/sys/dev/pdq/pdqvar.h
index d978809c2326..7eb6324543e3 100644
--- a/sys/dev/pdq/pdqvar.h
+++ b/sys/dev/pdq/pdqvar.h
@@ -214,9 +214,9 @@ typedef struct mbuf PDQ_OS_DATABUF_T;
 #ifndef PDQ_OS_DATABUF_ALLOC
 #define	PDQ_OS_DATABUF_ALLOC(pdq, b) do { \
     PDQ_OS_DATABUF_T *x_m0; \
-    MGETHDR(x_m0, M_DONTWAIT, MT_DATA); \
+    MGETHDR(x_m0, M_NOWAIT, MT_DATA); \
     if (x_m0 != NULL) { \
-	MCLGET(x_m0, M_DONTWAIT);	\
+	MCLGET(x_m0, M_NOWAIT);	\
 	if ((x_m0->m_flags & M_EXT) == 0) { \
 	    m_free(x_m0); \
 	    (b) = NULL; \
diff --git a/sys/dev/qlxgb/qla_os.c b/sys/dev/qlxgb/qla_os.c
index 546a81a1875d..b22fa9fc7d7d 100644
--- a/sys/dev/qlxgb/qla_os.c
+++ b/sys/dev/qlxgb/qla_os.c
@@ -1063,7 +1063,7 @@ qla_send(qla_host_t *ha, struct mbuf **m_headp)
 		QL_DPRINT8((ha->pci_dev, "%s: EFBIG [%d]\n", __func__,
 			m_head->m_pkthdr.len));
 
-		m = m_defrag(m_head, M_DONTWAIT);
+		m = m_defrag(m_head, M_NOWAIT);
 		if (m == NULL) {
 			ha->err_tx_defrag++;
 			m_freem(m_head);
@@ -1405,7 +1405,7 @@ qla_get_mbuf(qla_host_t *ha, qla_rx_buf_t *rxb, struct mbuf *nmp,
 	if (mp == NULL) {
 
 		if (!jumbo) {
-			mp = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+			mp = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 
 			if (mp == NULL) {
 				ha->err_m_getcl++;
@@ -1416,7 +1416,7 @@ qla_get_mbuf(qla_host_t *ha, qla_rx_buf_t *rxb, struct mbuf *nmp,
 			}
 			mp->m_len = mp->m_pkthdr.len = MCLBYTES;
 		} else {
-			mp = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+			mp = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 				MJUM9BYTES);
 			if (mp == NULL) {
 				ha->err_m_getjcl++;
diff --git a/sys/dev/ral/rt2560.c b/sys/dev/ral/rt2560.c
index 9fdc15770c61..c67f1f790145 100644
--- a/sys/dev/ral/rt2560.c
+++ b/sys/dev/ral/rt2560.c
@@ -673,7 +673,7 @@ rt2560_alloc_rx_ring(struct rt2560_softc *sc, struct rt2560_rx_ring *ring,
 			goto fail;
 		}
 
-		data->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		data->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (data->m == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not allocate rx mbuf\n");
@@ -1160,7 +1160,7 @@ rt2560_decryption_intr(struct rt2560_softc *sc)
 		 * mbuf. In the unlikely case that the old mbuf can't be
 		 * reloaded either, explicitly panic.
 		 */
-		mnew = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (mnew == NULL) {
 			ifp->if_ierrors++;
 			goto skip;
@@ -1844,7 +1844,7 @@ rt2560_tx_data(struct rt2560_softc *sc, struct mbuf *m0,
 		return error;
 	}
 	if (error != 0) {
-		mnew = m_defrag(m0, M_DONTWAIT);
+		mnew = m_defrag(m0, M_NOWAIT);
 		if (mnew == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
diff --git a/sys/dev/ral/rt2661.c b/sys/dev/ral/rt2661.c
index c4e8fe79930d..8ae2515c21b9 100644
--- a/sys/dev/ral/rt2661.c
+++ b/sys/dev/ral/rt2661.c
@@ -682,7 +682,7 @@ rt2661_alloc_rx_ring(struct rt2661_softc *sc, struct rt2661_rx_ring *ring,
 			goto fail;
 		}
 
-		data->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		data->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (data->m == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not allocate rx mbuf\n");
@@ -1030,7 +1030,7 @@ rt2661_rx_intr(struct rt2661_softc *sc)
 		 * mbuf. In the unlikely case that the old mbuf can't be
 		 * reloaded either, explicitly panic.
 		 */
-		mnew = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (mnew == NULL) {
 			ifp->if_ierrors++;
 			goto skip;
@@ -1534,7 +1534,7 @@ rt2661_tx_data(struct rt2661_softc *sc, struct mbuf *m0,
 		return error;
 	}
 	if (error != 0) {
-		mnew = m_defrag(m0, M_DONTWAIT);
+		mnew = m_defrag(m0, M_NOWAIT);
 		if (mnew == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
diff --git a/sys/dev/ral/rt2860.c b/sys/dev/ral/rt2860.c
index 4a5aa259c0e6..4207d7556d27 100644
--- a/sys/dev/ral/rt2860.c
+++ b/sys/dev/ral/rt2860.c
@@ -743,7 +743,7 @@ rt2860_alloc_rx_ring(struct rt2860_softc *sc, struct rt2860_rx_ring *ring)
 			goto fail;
 		}
 
-		data->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		data->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (data->m == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not allocate rx mbuf\n");
@@ -1237,7 +1237,7 @@ rt2860_rx_intr(struct rt2860_softc *sc)
 		}
 #endif
 
-		m1 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m1 = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (__predict_false(m1 == NULL)) {
 			ifp->if_ierrors++;
 			goto skip;
@@ -1625,7 +1625,7 @@ rt2860_tx(struct rt2860_softc *sc, struct mbuf *m, struct ieee80211_node *ni)
 		}
 	}
 	if (__predict_false(error != 0)) {
-		m1 = m_defrag(m, M_DONTWAIT);
+		m1 = m_defrag(m, M_NOWAIT);
 		if (m1 == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
@@ -1877,7 +1877,7 @@ rt2860_tx_raw(struct rt2860_softc *sc, struct mbuf *m,
 		}
 	}
 	if (__predict_false(error != 0)) {
-		m1 = m_defrag(m, M_DONTWAIT);
+		m1 = m_defrag(m, M_NOWAIT);
 		if (m1 == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
diff --git a/sys/dev/re/if_re.c b/sys/dev/re/if_re.c
index 5f543181785b..9ec914af412f 100644
--- a/sys/dev/re/if_re.c
+++ b/sys/dev/re/if_re.c
@@ -758,7 +758,7 @@ re_diag(struct rl_softc *sc)
 	u_int8_t		src[] = { 0x00, 'w', 'o', 'r', 'l', 'd' };
 
 	/* Allocate a single mbuf */
-	MGETHDR(m0, M_DONTWAIT, MT_DATA);
+	MGETHDR(m0, M_NOWAIT, MT_DATA);
 	if (m0 == NULL)
 		return (ENOBUFS);
 
@@ -1886,7 +1886,7 @@ re_newbuf(struct rl_softc *sc, int idx)
 	uint32_t		cmdstat;
 	int			error, nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 
@@ -1950,7 +1950,7 @@ re_jumbo_newbuf(struct rl_softc *sc, int idx)
 	uint32_t		cmdstat;
 	int			error, nsegs;
 
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MJUM9BYTES;
@@ -2700,7 +2700,7 @@ re_encap(struct rl_softc *sc, struct mbuf **m_head)
 		padlen = RL_MIN_FRAMELEN - (*m_head)->m_pkthdr.len;
 		if (M_WRITABLE(*m_head) == 0) {
 			/* Get a writable copy. */
-			m_new = m_dup(*m_head, M_DONTWAIT);
+			m_new = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m_new == NULL) {
 				*m_head = NULL;
@@ -2710,7 +2710,7 @@ re_encap(struct rl_softc *sc, struct mbuf **m_head)
 		}
 		if ((*m_head)->m_next != NULL ||
 		    M_TRAILINGSPACE(*m_head) < padlen) {
-			m_new = m_defrag(*m_head, M_DONTWAIT);
+			m_new = m_defrag(*m_head, M_NOWAIT);
 			if (m_new == NULL) {
 				m_freem(*m_head);
 				*m_head = NULL;
@@ -2734,7 +2734,7 @@ re_encap(struct rl_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->rl_ldata.rl_tx_mtag, txd->tx_dmamap,
 	    *m_head, segs, &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m_new = m_collapse(*m_head, M_DONTWAIT, RL_NTXSEGS);
+		m_new = m_collapse(*m_head, M_NOWAIT, RL_NTXSEGS);
 		if (m_new == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/rt/if_rt.c b/sys/dev/rt/if_rt.c
index 664978202a55..ebbbba5e9d57 100644
--- a/sys/dev/rt/if_rt.c
+++ b/sys/dev/rt/if_rt.c
@@ -892,7 +892,7 @@ rt_tx_data(struct rt_softc *sc, struct mbuf *m, int qid)
 			"mbuf: ndmasegs=%d, len=%d, error=%d\n",
 			ndmasegs, m->m_pkthdr.len, error);
 
-		m_d = m_collapse(m, M_DONTWAIT, 16);
+		m_d = m_collapse(m, M_NOWAIT, 16);
 		if (m_d == NULL) {
 			m_freem(m);
 			m = NULL;
@@ -1637,7 +1637,7 @@ rt_rx_eof(struct rt_softc *sc, int limit)
 
 		nframes++;
 
-		mnew = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+		mnew = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 		    MJUMPAGESIZE);
 		if (mnew == NULL) {
 			sc->rx_mbuf_alloc_errors++;
@@ -2009,7 +2009,7 @@ rt_alloc_rx_ring(struct rt_softc *sc, struct rt_softc_rx_ring *ring)
 			goto fail;
 		}
 
-		data->m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+		data->m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 		    MJUMPAGESIZE);
 		if (data->m == NULL) {
 			device_printf(sc->dev, "could not allocate Rx mbuf\n");
diff --git a/sys/dev/safe/safe.c b/sys/dev/safe/safe.c
index 6095aa385766..396a93ccd9d3 100644
--- a/sys/dev/safe/safe.c
+++ b/sys/dev/safe/safe.c
@@ -1325,15 +1325,15 @@ safe_process(device_t dev, struct cryptop *crp, int hint)
 				totlen = re->re_src_mapsize;
 				if (re->re_src_m->m_flags & M_PKTHDR) {
 					len = MHLEN;
-					MGETHDR(m, M_DONTWAIT, MT_DATA);
+					MGETHDR(m, M_NOWAIT, MT_DATA);
 					if (m && !m_dup_pkthdr(m, re->re_src_m,
-					    M_DONTWAIT)) {
+					    M_NOWAIT)) {
 						m_free(m);
 						m = NULL;
 					}
 				} else {
 					len = MLEN;
-					MGET(m, M_DONTWAIT, MT_DATA);
+					MGET(m, M_NOWAIT, MT_DATA);
 				}
 				if (m == NULL) {
 					safestats.st_nombuf++;
@@ -1341,7 +1341,7 @@ safe_process(device_t dev, struct cryptop *crp, int hint)
 					goto errout;
 				}
 				if (totlen >= MINCLSIZE) {
-					MCLGET(m, M_DONTWAIT);
+					MCLGET(m, M_NOWAIT);
 					if ((m->m_flags & M_EXT) == 0) {
 						m_free(m);
 						safestats.st_nomcl++;
@@ -1357,7 +1357,7 @@ safe_process(device_t dev, struct cryptop *crp, int hint)
 
 				while (totlen > 0) {
 					if (top) {
-						MGET(m, M_DONTWAIT, MT_DATA);
+						MGET(m, M_NOWAIT, MT_DATA);
 						if (m == NULL) {
 							m_freem(top);
 							safestats.st_nombuf++;
@@ -1368,7 +1368,7 @@ safe_process(device_t dev, struct cryptop *crp, int hint)
 						len = MLEN;
 					}
 					if (top && totlen >= MINCLSIZE) {
-						MCLGET(m, M_DONTWAIT);
+						MCLGET(m, M_NOWAIT);
 						if ((m->m_flags & M_EXT) == 0) {
 							*mp = m;
 							m_freem(top);
diff --git a/sys/dev/sbni/if_sbni.c b/sys/dev/sbni/if_sbni.c
index 7ca46d31115c..dc1b6eb56474 100644
--- a/sys/dev/sbni/if_sbni.c
+++ b/sys/dev/sbni/if_sbni.c
@@ -863,7 +863,7 @@ get_rx_buf(struct sbni_softc *sc)
 {
 	struct mbuf *m;
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL) {
 		if_printf(sc->ifp, "cannot allocate header mbuf\n");
 		return (0);
@@ -877,7 +877,7 @@ get_rx_buf(struct sbni_softc *sc)
 	 */
 	if (ETHER_MAX_LEN + 2 > MHLEN) {
 		/* Attach an mbuf cluster */
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 		if ((m->m_flags & M_EXT) == 0) {
 			m_freem(m);
 			return (0);
diff --git a/sys/dev/sf/if_sf.c b/sys/dev/sf/if_sf.c
index ec3aa27abb20..7280801bcf67 100644
--- a/sys/dev/sf/if_sf.c
+++ b/sys/dev/sf/if_sf.c
@@ -1455,7 +1455,7 @@ sf_newbuf(struct sf_softc *sc, int idx)
 	bus_dmamap_t		map;
 	int			nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -2171,7 +2171,7 @@ sf_encap(struct sf_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->sf_cdata.sf_tx_tag, map,
 	    *m_head, txsegs, &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, SF_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, SF_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/sfxge/sfxge_dma.c b/sys/dev/sfxge/sfxge_dma.c
index 076c7c68a9ad..f0d17544a0de 100644
--- a/sys/dev/sfxge/sfxge_dma.c
+++ b/sys/dev/sfxge/sfxge_dma.c
@@ -97,7 +97,7 @@ sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
 		goto err_out;
 	} else if (err == EFBIG || seg_count >= maxsegs) {
 		if (!defragged) {
-			m = m_defrag(*mp, M_DONTWAIT);
+			m = m_defrag(*mp, M_NOWAIT);
 			if (m == NULL) {
 				err = ENOBUFS;
 				goto err_out;
diff --git a/sys/dev/sfxge/sfxge_tx.c b/sys/dev/sfxge/sfxge_tx.c
index 801787a7add3..33f26d904ef4 100644
--- a/sys/dev/sfxge/sfxge_tx.c
+++ b/sys/dev/sfxge/sfxge_tx.c
@@ -262,7 +262,7 @@ static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf)
 				     mbuf, dma_seg, &n_dma_seg, 0);
 	if (rc == EFBIG) {
 		/* Try again. */
-		struct mbuf *new_mbuf = m_collapse(mbuf, M_DONTWAIT,
+		struct mbuf *new_mbuf = m_collapse(mbuf, M_NOWAIT,
 						   SFXGE_TX_MAPPING_MAX_SEG);
 		if (new_mbuf == NULL)
 			goto reject;
diff --git a/sys/dev/sge/if_sge.c b/sys/dev/sge/if_sge.c
index 68679fe89340..8482bb27486f 100644
--- a/sys/dev/sge/if_sge.c
+++ b/sys/dev/sge/if_sge.c
@@ -1083,7 +1083,7 @@ sge_newbuf(struct sge_softc *sc, int prod)
 	SGE_LOCK_ASSERT(sc);
 
 	cd = &sc->sge_cdata;
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1407,7 +1407,7 @@ sge_encap(struct sge_softc *sc, struct mbuf **m_head)
 
 		if (M_WRITABLE(*m_head) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -1464,7 +1464,7 @@ sge_encap(struct sge_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->sge_cdata.sge_txmbuf_tag,
 	    txd->tx_dmamap, *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, SGE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, SGE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/sis/if_sis.c b/sys/dev/sis/if_sis.c
index 2e93afa06424..456c3d4fd2b8 100644
--- a/sys/dev/sis/if_sis.c
+++ b/sys/dev/sis/if_sis.c
@@ -1411,7 +1411,7 @@ sis_newbuf(struct sis_softc *sc, struct sis_rxdesc *rxd)
 	bus_dmamap_t		map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = SIS_RXLEN;
@@ -1771,7 +1771,7 @@ sis_encap(struct sis_softc *sc, struct mbuf **m_head)
 		padlen = SIS_MIN_FRAMELEN - m->m_pkthdr.len;
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -1780,7 +1780,7 @@ sis_encap(struct sis_softc *sc, struct mbuf **m_head)
 			*m_head = m;
 		}
 		if (m->m_next != NULL || M_TRAILINGSPACE(m) < padlen) {
-			m = m_defrag(m, M_DONTWAIT);
+			m = m_defrag(m, M_NOWAIT);
 			if (m == NULL) {
 				m_freem(*m_head);
 				*m_head = NULL;
@@ -1799,7 +1799,7 @@ sis_encap(struct sis_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->sis_tx_tag, txd->tx_dmamap,
 	    *m_head, segs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, SIS_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, SIS_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/sk/if_sk.c b/sys/dev/sk/if_sk.c
index 836c34d4eab9..120810d3ca8f 100644
--- a/sys/dev/sk/if_sk.c
+++ b/sys/dev/sk/if_sk.c
@@ -965,7 +965,7 @@ sk_newbuf(sc_if, idx)
 	bus_dmamap_t		map;
 	int			nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1010,7 +1010,7 @@ sk_jumbo_newbuf(sc_if, idx)
 	bus_dmamap_t		map;
 	int			nsegs;
 
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
 	if (m == NULL)
 		return (ENOBUFS);
 	if ((m->m_flags & M_EXT) == 0) {
@@ -2393,7 +2393,7 @@ sk_encap(sc_if, m_head)
 	error = bus_dmamap_load_mbuf_sg(sc_if->sk_cdata.sk_tx_tag,
 	    txd->tx_dmamap, *m_head, txsegs, &nseg, 0);
 	if (error == EFBIG) {
-		m = m_defrag(*m_head, M_DONTWAIT);
+		m = m_defrag(*m_head, M_NOWAIT);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/smc/if_smc.c b/sys/dev/smc/if_smc.c
index cece5b7e0691..06f6ca0a3c59 100644
--- a/sys/dev/smc/if_smc.c
+++ b/sys/dev/smc/if_smc.c
@@ -688,11 +688,11 @@ smc_task_rx(void *context, int pending)
 		/*
 		 * Grab an mbuf and attach a cluster.
 		 */
-		MGETHDR(m, M_DONTWAIT, MT_DATA);
+		MGETHDR(m, M_NOWAIT, MT_DATA);
 		if (m == NULL) {
 			break;
 		}
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 		if ((m->m_flags & M_EXT) == 0) {
 			m_freem(m);
 			break;
diff --git a/sys/dev/sn/if_sn.c b/sys/dev/sn/if_sn.c
index 8aef549dcc15..d7cc20d0b611 100644
--- a/sys/dev/sn/if_sn.c
+++ b/sys/dev/sn/if_sn.c
@@ -1056,7 +1056,7 @@ snread(struct ifnet *ifp)
 	/*
 	 * Allocate a header mbuf from the kernel.
 	 */
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		goto out;
 
@@ -1066,7 +1066,7 @@ snread(struct ifnet *ifp)
 	/*
 	 * Attach an mbuf cluster
 	 */
-	MCLGET(m, M_DONTWAIT);
+	MCLGET(m, M_NOWAIT);
 
 	/*
 	 * Insist on getting a cluster
diff --git a/sys/dev/snc/dp83932.c b/sys/dev/snc/dp83932.c
index 17b67cd418f7..a41ceedca1f9 100644
--- a/sys/dev/snc/dp83932.c
+++ b/sys/dev/snc/dp83932.c
@@ -1108,7 +1108,7 @@ sonic_get(struct snc_softc *sc, u_int32_t pkt, int datalen)
 	 * Our sonic_read() and sonic_get() require it.
 	 */
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == 0)
 		return (0);
 	m->m_pkthdr.rcvif = sc->sc_ifp;
@@ -1119,7 +1119,7 @@ sonic_get(struct snc_softc *sc, u_int32_t pkt, int datalen)
 
 	while (datalen > 0) {
 		if (top) {
-			MGET(m, M_DONTWAIT, MT_DATA);
+			MGET(m, M_NOWAIT, MT_DATA);
 			if (m == 0) {
 				m_freem(top);
 				return (0);
@@ -1127,7 +1127,7 @@ sonic_get(struct snc_softc *sc, u_int32_t pkt, int datalen)
 			len = MLEN;
 		}
 		if (datalen >= MINCLSIZE) {
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if ((m->m_flags & M_EXT) == 0) {
 				if (top) m_freem(top);
 				return (0);
diff --git a/sys/dev/ste/if_ste.c b/sys/dev/ste/if_ste.c
index 742d497665b7..be2e8b2f2d00 100644
--- a/sys/dev/ste/if_ste.c
+++ b/sys/dev/ste/if_ste.c
@@ -1385,7 +1385,7 @@ ste_newbuf(struct ste_softc *sc, struct ste_chain_onefrag *rxc)
 	bus_dmamap_t map;
 	int error, nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1824,7 +1824,7 @@ ste_encap(struct ste_softc *sc, struct mbuf **m_head, struct ste_chain *txc)
 	error = bus_dmamap_load_mbuf_sg(sc->ste_cdata.ste_tx_tag,
 	    txc->ste_map, *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, STE_MAXFRAGS);
+		m = m_collapse(*m_head, M_NOWAIT, STE_MAXFRAGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/stge/if_stge.c b/sys/dev/stge/if_stge.c
index 7d22540c7161..96860a88827d 100644
--- a/sys/dev/stge/if_stge.c
+++ b/sys/dev/stge/if_stge.c
@@ -1081,7 +1081,7 @@ stge_encap(struct stge_softc *sc, struct mbuf **m_head)
 	error =  bus_dmamap_load_mbuf_sg(sc->sc_cdata.stge_tx_tag,
 	    txd->tx_dmamap, *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, STGE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, STGE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -1609,7 +1609,7 @@ stge_fixup_rx(struct stge_softc *sc, struct mbuf *m)
 		m->m_data += ETHER_HDR_LEN;
 		n = m;
 	} else {
-		MGETHDR(n, M_DONTWAIT, MT_DATA);
+		MGETHDR(n, M_NOWAIT, MT_DATA);
 		if (n != NULL) {
 			bcopy(m->m_data, n->m_data, ETHER_HDR_LEN);
 			m->m_data += ETHER_HDR_LEN;
@@ -2439,7 +2439,7 @@ stge_newbuf(struct stge_softc *sc, int idx)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
diff --git a/sys/dev/ti/if_ti.c b/sys/dev/ti/if_ti.c
index d31af291c682..f8142b476018 100644
--- a/sys/dev/ti/if_ti.c
+++ b/sys/dev/ti/if_ti.c
@@ -1381,7 +1381,7 @@ ti_newbuf_std(struct ti_softc *sc, int i)
 	struct ti_rx_desc *r;
 	int error, nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1436,7 +1436,7 @@ ti_newbuf_mini(struct ti_softc *sc, int i)
 	struct ti_rx_desc *r;
 	int error, nsegs;
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MHLEN;
@@ -1495,7 +1495,7 @@ ti_newbuf_jumbo(struct ti_softc *sc, int i, struct mbuf *dummy)
 
 	(void)dummy;
 
-	m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
+	m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUM9BYTES);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MJUM9BYTES;
@@ -1577,19 +1577,19 @@ ti_newbuf_jumbo(struct ti_softc *sc, int idx, struct mbuf *m_old)
 		}
 	} else {
 		/* Allocate the mbufs. */
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL) {
 			device_printf(sc->ti_dev, "mbuf allocation failed "
 			    "-- packet dropped!\n");
 			goto nobufs;
 		}
-		MGET(m[NPAYLOAD], M_DONTWAIT, MT_DATA);
+		MGET(m[NPAYLOAD], M_NOWAIT, MT_DATA);
 		if (m[NPAYLOAD] == NULL) {
 			device_printf(sc->ti_dev, "cluster mbuf allocation "
 			    "failed -- packet dropped!\n");
 			goto nobufs;
 		}
-		MCLGET(m[NPAYLOAD], M_DONTWAIT);
+		MCLGET(m[NPAYLOAD], M_NOWAIT);
 		if ((m[NPAYLOAD]->m_flags & M_EXT) == 0) {
 			device_printf(sc->ti_dev, "mbuf allocation failed "
 			    "-- packet dropped!\n");
@@ -1598,7 +1598,7 @@ ti_newbuf_jumbo(struct ti_softc *sc, int idx, struct mbuf *m_old)
 		m[NPAYLOAD]->m_len = MCLBYTES;
 
 		for (i = 0; i < NPAYLOAD; i++){
-			MGET(m[i], M_DONTWAIT, MT_DATA);
+			MGET(m[i], M_NOWAIT, MT_DATA);
 			if (m[i] == NULL) {
 				device_printf(sc->ti_dev, "mbuf allocation "
 				    "failed -- packet dropped!\n");
@@ -3051,7 +3051,7 @@ ti_encap(struct ti_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->ti_cdata.ti_tx_tag, txd->tx_dmamap,
 	    *m_head, txsegs, &nseg, 0);
 	if (error == EFBIG) {
-		m = m_defrag(*m_head, M_DONTWAIT);
+		m = m_defrag(*m_head, M_NOWAIT);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/tl/if_tl.c b/sys/dev/tl/if_tl.c
index 0c8725dbecce..30969e2aef15 100644
--- a/sys/dev/tl/if_tl.c
+++ b/sys/dev/tl/if_tl.c
@@ -1365,7 +1365,7 @@ tl_newbuf(sc, c)
 {
 	struct mbuf		*m_new = NULL;
 
-	m_new = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m_new = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m_new == NULL)
 		return(ENOBUFS);
 
@@ -1806,13 +1806,13 @@ tl_encap(sc, c, m_head)
 	if (m != NULL) {
 		struct mbuf		*m_new = NULL;
 
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL) {
 			if_printf(ifp, "no memory for tx list\n");
 			return(1);
 		}
 		if (m_head->m_pkthdr.len > MHLEN) {
-			MCLGET(m_new, M_DONTWAIT);
+			MCLGET(m_new, M_NOWAIT);
 			if (!(m_new->m_flags & M_EXT)) {
 				m_freem(m_new);
 				if_printf(ifp, "no memory for tx list\n");
diff --git a/sys/dev/tsec/if_tsec.c b/sys/dev/tsec/if_tsec.c
index 1d87b30d5e86..804177685823 100644
--- a/sys/dev/tsec/if_tsec.c
+++ b/sys/dev/tsec/if_tsec.c
@@ -727,7 +727,7 @@ tsec_start_locked(struct ifnet *ifp)
 		csum_flags = m0->m_pkthdr.csum_flags;
 		if (csum_flags) {
 
-			M_PREPEND(m0, sizeof(struct tsec_tx_fcb), M_DONTWAIT);
+			M_PREPEND(m0, sizeof(struct tsec_tx_fcb), M_NOWAIT);
 			if (m0 == NULL)
 				break;
 
@@ -751,7 +751,7 @@ tsec_start_locked(struct ifnet *ifp)
 			fcb_inserted = 1;
 		}
 
-		mtmp = m_defrag(m0, M_DONTWAIT);
+		mtmp = m_defrag(m0, M_NOWAIT);
 		if (mtmp)
 			m0 = mtmp;
 
@@ -1029,7 +1029,7 @@ tsec_new_rxbuf(bus_dma_tag_t tag, bus_dmamap_t map, struct mbuf **mbufp,
 
 	KASSERT(mbufp != NULL, ("NULL mbuf pointer!"));
 
-	new_mbuf = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MCLBYTES);
+	new_mbuf = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MCLBYTES);
 	if (new_mbuf == NULL)
 		return (ENOBUFS);
 	new_mbuf->m_len = new_mbuf->m_pkthdr.len = new_mbuf->m_ext.ext_size;
diff --git a/sys/dev/tx/if_tx.c b/sys/dev/tx/if_tx.c
index c977909222e5..66f54802a4fe 100644
--- a/sys/dev/tx/if_tx.c
+++ b/sys/dev/tx/if_tx.c
@@ -682,7 +682,7 @@ epic_ifstart_locked(struct ifnet * ifp)
 		 * recopy packet to a newly allocated mbuf cluster.
 		 */
 		if (error) {
-			m = m_defrag(m0, M_DONTWAIT);
+			m = m_defrag(m0, M_NOWAIT);
 			if (m == NULL) {
 				m_freem(m0);
 				ifp->if_oerrors++;
@@ -761,7 +761,7 @@ epic_rx_done(epic_softc_t *sc)
 		m = buf->mbuf;
 
 		/* Try to get an mbuf cluster. */
-		buf->mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		buf->mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (buf->mbuf == NULL) {
 			buf->mbuf = m;
 			desc->status = 0x8000;
@@ -1495,7 +1495,7 @@ epic_queue_last_packet(epic_softc_t *sc)
 	if ((desc->status & 0x8000) || (buf->mbuf != NULL))
 		return (EBUSY);
 
-	MGETHDR(m0, M_DONTWAIT, MT_DATA);
+	MGETHDR(m0, M_NOWAIT, MT_DATA);
 	if (m0 == NULL)
 		return (ENOBUFS);
 
@@ -1644,7 +1644,7 @@ epic_init_rings(epic_softc_t *sc)
 			return (EFAULT);
 		}
 
-		buf->mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		buf->mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (buf->mbuf == NULL) {
 			epic_free_rings(sc);
 			return (ENOBUFS);
diff --git a/sys/dev/txp/if_txp.c b/sys/dev/txp/if_txp.c
index e51489f54899..bc6f016ef633 100644
--- a/sys/dev/txp/if_txp.c
+++ b/sys/dev/txp/if_txp.c
@@ -1015,7 +1015,7 @@ txp_rxbuf_reclaim(struct txp_softc *sc)
 			break;
 		rbd = sc->sc_rxbufs + prod;
 		bcopy((u_long *)&rbd->rb_vaddrlo, &sd, sizeof(sd));
-		sd->sd_mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		sd->sd_mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (sd->sd_mbuf == NULL)
 			break;
 		sd->sd_mbuf->m_pkthdr.len = sd->sd_mbuf->m_len = MCLBYTES;
@@ -1792,7 +1792,7 @@ txp_rxring_fill(struct txp_softc *sc)
 		bcopy(&sd, (u_long *)&rbd->rb_vaddrlo, sizeof(sd));
 		KASSERT(sd->sd_mbuf == NULL,
 		    ("%s : Rx buffer ring corrupted", __func__));
-		sd->sd_mbuf = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		sd->sd_mbuf = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (sd->sd_mbuf == NULL)
 			return (ENOMEM);
 		sd->sd_mbuf->m_pkthdr.len = sd->sd_mbuf->m_len = MCLBYTES;
@@ -2105,7 +2105,7 @@ txp_encap(struct txp_softc *sc, struct txp_tx_ring *r, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->sc_cdata.txp_tx_tag, sd->sd_map,
 	    *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, TXP_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, TXP_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/ubsec/ubsec.c b/sys/dev/ubsec/ubsec.c
index ee5a5b9de64c..40e6d5eccc2d 100644
--- a/sys/dev/ubsec/ubsec.c
+++ b/sys/dev/ubsec/ubsec.c
@@ -1375,18 +1375,18 @@ ubsec_process(device_t dev, struct cryptop *crp, int hint)
 				ubsecstats.hst_unaligned++;
 				totlen = q->q_src_mapsize;
 				if (totlen >= MINCLSIZE) {
-					m = m_getcl(M_DONTWAIT, MT_DATA,
+					m = m_getcl(M_NOWAIT, MT_DATA,
 					    q->q_src_m->m_flags & M_PKTHDR);
 					len = MCLBYTES;
 				} else if (q->q_src_m->m_flags & M_PKTHDR) {
-					m = m_gethdr(M_DONTWAIT, MT_DATA);
+					m = m_gethdr(M_NOWAIT, MT_DATA);
 					len = MHLEN;
 				} else {
-					m = m_get(M_DONTWAIT, MT_DATA);
+					m = m_get(M_NOWAIT, MT_DATA);
 					len = MLEN;
 				}
 				if (m && q->q_src_m->m_flags & M_PKTHDR &&
-				    !m_dup_pkthdr(m, q->q_src_m, M_DONTWAIT)) {
+				    !m_dup_pkthdr(m, q->q_src_m, M_NOWAIT)) {
 					m_free(m);
 					m = NULL;
 				}
@@ -1402,11 +1402,11 @@ ubsec_process(device_t dev, struct cryptop *crp, int hint)
 
 				while (totlen > 0) {
 					if (totlen >= MINCLSIZE) {
-						m = m_getcl(M_DONTWAIT,
+						m = m_getcl(M_NOWAIT,
 						    MT_DATA, 0);
 						len = MCLBYTES;
 					} else {
-						m = m_get(M_DONTWAIT, MT_DATA);
+						m = m_get(M_NOWAIT, MT_DATA);
 						len = MLEN;
 					}
 					if (m == NULL) {
diff --git a/sys/dev/usb/misc/udbp.c b/sys/dev/usb/misc/udbp.c
index 150985e8e781..56f86ae4897b 100644
--- a/sys/dev/usb/misc/udbp.c
+++ b/sys/dev/usb/misc/udbp.c
@@ -410,12 +410,12 @@ udbp_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 
 		/* allocate new mbuf */
 
-		MGETHDR(m, M_DONTWAIT, MT_DATA);
+		MGETHDR(m, M_NOWAIT, MT_DATA);
 
 		if (m == NULL) {
 			goto tr_setup;
 		}
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 
 		if (!(m->m_flags & M_EXT)) {
 			m_freem(m);
diff --git a/sys/dev/usb/net/if_axe.c b/sys/dev/usb/net/if_axe.c
index 2f9929f92264..694e5a5c845a 100644
--- a/sys/dev/usb/net/if_axe.c
+++ b/sys/dev/usb/net/if_axe.c
@@ -1114,7 +1114,7 @@ axe_rxeof(struct usb_ether *ue, struct usb_page_cache *pc, unsigned int offset,
 		return (EINVAL);
 	}
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL) {
 		ifp->if_iqdrops++;
 		return (ENOMEM);
diff --git a/sys/dev/usb/net/if_cdce.c b/sys/dev/usb/net/if_cdce.c
index 780efe867895..6e0ce97c36f8 100644
--- a/sys/dev/usb/net/if_cdce.c
+++ b/sys/dev/usb/net/if_cdce.c
@@ -753,7 +753,7 @@ cdce_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
 				}
 			}
 			if (m->m_len != m->m_pkthdr.len) {
-				mt = m_defrag(m, M_DONTWAIT);
+				mt = m_defrag(m, M_NOWAIT);
 				if (mt == NULL) {
 					m_freem(m);
 					ifp->if_oerrors++;
@@ -1369,9 +1369,9 @@ cdce_ncm_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 				/* silently ignore this frame */
 				continue;
 			} else if (temp > (int)(MHLEN - ETHER_ALIGN)) {
-				m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+				m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 			} else {
-				m = m_gethdr(M_DONTWAIT, MT_DATA);
+				m = m_gethdr(M_NOWAIT, MT_DATA);
 			}
 
 			DPRINTFN(16, "frame %u, offset = %u, length = %u \n",
diff --git a/sys/dev/usb/net/if_usie.c b/sys/dev/usb/net/if_usie.c
index cdbdd6b9c4e3..f3dbd9e15430 100644
--- a/sys/dev/usb/net/if_usie.c
+++ b/sys/dev/usb/net/if_usie.c
@@ -796,7 +796,7 @@ usie_if_rx_callback(struct usb_xfer *xfer, usb_error_t error)
 tr_setup:
 
 		if (sc->sc_rxm == NULL) {
-			sc->sc_rxm = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+			sc->sc_rxm = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 			    MJUMPAGESIZE /* could be bigger than MCLBYTES */ );
 		}
 		if (sc->sc_rxm == NULL) {
@@ -892,7 +892,7 @@ usie_if_rx_callback(struct usb_xfer *xfer, usb_error_t error)
 			break;
 		}
 		/* copy aggregated frames to another mbuf */
-		m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m0 = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (__predict_false(m0 == NULL)) {
 			DPRINTF("could not allocate mbuf\n");
 			err++;
@@ -1388,7 +1388,7 @@ usie_cns_req(struct usie_softc *sc, uint32_t id, uint16_t obj)
 	uint8_t *tmp;
 	uint8_t cns_len;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (__predict_false(m == NULL)) {
 		DPRINTF("could not allocate mbuf\n");
 		ifp->if_ierrors++;
diff --git a/sys/dev/usb/net/uhso.c b/sys/dev/usb/net/uhso.c
index 40dd1f4848cd..96c633533405 100644
--- a/sys/dev/usb/net/uhso.c
+++ b/sys/dev/usb/net/uhso.c
@@ -1619,7 +1619,7 @@ uhso_ifnet_read_callback(struct usb_xfer *xfer, usb_error_t error)
 	case USB_ST_TRANSFERRED:
 		if (actlen > 0 && (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 			pc = usbd_xfer_get_frame(xfer, 0);
-			m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+			m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 			usbd_copy_out(pc, 0, mtod(m, uint8_t *), actlen);
 			m->m_pkthdr.len = m->m_len = actlen;
 			/* Enqueue frame for further processing */
@@ -1752,13 +1752,13 @@ uhso_if_rxflush(void *arg)
 			 * Allocate a new mbuf for this IP packet and
 			 * copy the IP-packet into it.
 			 */
-			m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+			m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 			memcpy(mtod(m, uint8_t *), mtod(m0, uint8_t *), iplen);
 			m->m_pkthdr.len = m->m_len = iplen;
 
 			/* Adjust the size of the original mbuf */
 			m_adj(m0, iplen);
-			m0 = m_defrag(m0, M_WAIT);
+			m0 = m_defrag(m0, M_WAITOK);
 
 			UHSO_DPRINTF(3, "New mbuf=%p, len=%d/%d, m0=%p, "
 			    "m0_len=%d/%d\n", m, m->m_pkthdr.len, m->m_len,
diff --git a/sys/dev/usb/net/usb_ethernet.c b/sys/dev/usb/net/usb_ethernet.c
index 2a7bddfdbe3d..2f1795915d80 100644
--- a/sys/dev/usb/net/usb_ethernet.c
+++ b/sys/dev/usb/net/usb_ethernet.c
@@ -557,7 +557,7 @@ uether_newbuf(void)
 {
 	struct mbuf *m_new;
 
-	m_new = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m_new = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m_new == NULL)
 		return (NULL);
 	m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
diff --git a/sys/dev/usb/wlan/if_rum.c b/sys/dev/usb/wlan/if_rum.c
index 93e66de82872..4c54aebf5f10 100644
--- a/sys/dev/usb/wlan/if_rum.c
+++ b/sys/dev/usb/wlan/if_rum.c
@@ -907,7 +907,7 @@ rum_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			goto tr_setup;
 		}
 
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m == NULL) {
 			DPRINTF("could not allocate mbuf\n");
 			ifp->if_ierrors++;
diff --git a/sys/dev/usb/wlan/if_run.c b/sys/dev/usb/wlan/if_run.c
index d5c86a6e4788..3d2577f121a4 100644
--- a/sys/dev/usb/wlan/if_run.c
+++ b/sys/dev/usb/wlan/if_run.c
@@ -2595,7 +2595,7 @@ run_bulk_rx_callback(struct usb_xfer *xfer, usb_error_t error)
 	case USB_ST_SETUP:
 tr_setup:
 		if (sc->rx_m == NULL) {
-			sc->rx_m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
+			sc->rx_m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
 			    MJUMPAGESIZE /* xfer can be bigger than MCLBYTES */);
 		}
 		if (sc->rx_m == NULL) {
@@ -2669,7 +2669,7 @@ run_bulk_rx_callback(struct usb_xfer *xfer, usb_error_t error)
 		}
 
 		/* copy aggregated frames to another mbuf */
-		m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m0 = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (__predict_false(m0 == NULL)) {
 			DPRINTF("could not allocate mbuf\n");
 			ifp->if_ierrors++;
diff --git a/sys/dev/usb/wlan/if_uath.c b/sys/dev/usb/wlan/if_uath.c
index b78d7bfa2fa5..25e62a7908ac 100644
--- a/sys/dev/usb/wlan/if_uath.c
+++ b/sys/dev/usb/wlan/if_uath.c
@@ -966,7 +966,7 @@ uath_alloc_data_list(struct uath_softc *sc, struct uath_data data[],
 		dp->sc = sc;
 		if (fillmbuf) {
 			/* XXX check maxsz */
-			dp->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+			dp->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 			if (dp->m == NULL) {
 				device_printf(sc->sc_dev,
 				    "could not allocate rx mbuf\n");
@@ -2611,7 +2611,7 @@ uath_data_rxeof(struct usb_xfer *xfer, struct uath_data *data,
 	}
 	sc->sc_intrx_len += chunklen;
 
-	mnew = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (mnew == NULL) {
 		DPRINTF(sc, UATH_DEBUG_RECV | UATH_DEBUG_RECV_ALL,
 		    "%s: can't get new mbuf, drop frame\n", __func__);
diff --git a/sys/dev/usb/wlan/if_upgt.c b/sys/dev/usb/wlan/if_upgt.c
index ab5b7173e855..ec2b0d9f5112 100644
--- a/sys/dev/usb/wlan/if_upgt.c
+++ b/sys/dev/usb/wlan/if_upgt.c
@@ -1493,7 +1493,7 @@ upgt_rx(struct upgt_softc *sc, uint8_t *data, int pkglen, int *rssi)
 	/* create mbuf which is suitable for strict alignment archs */
 	KASSERT((pkglen + ETHER_ALIGN) < MCLBYTES,
 	    ("A current mbuf storage is small (%d)", pkglen + ETHER_ALIGN));
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL) {
 		device_printf(sc->sc_dev, "could not create RX mbuf\n");
 		return (NULL);
diff --git a/sys/dev/usb/wlan/if_ural.c b/sys/dev/usb/wlan/if_ural.c
index 60096bda3856..14c28687a6cc 100644
--- a/sys/dev/usb/wlan/if_ural.c
+++ b/sys/dev/usb/wlan/if_ural.c
@@ -913,7 +913,7 @@ ural_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
 			goto tr_setup;
 		}
 
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 		if (m == NULL) {
 			DPRINTF("could not allocate mbuf\n");
 			ifp->if_ierrors++;
diff --git a/sys/dev/usb/wlan/if_urtw.c b/sys/dev/usb/wlan/if_urtw.c
index 45b72a272981..2c30f6766db1 100644
--- a/sys/dev/usb/wlan/if_urtw.c
+++ b/sys/dev/usb/wlan/if_urtw.c
@@ -1458,7 +1458,7 @@ urtw_alloc_data_list(struct urtw_softc *sc, struct urtw_data data[],
 
 		dp->sc = sc;
 		if (fillmbuf) {
-			dp->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+			dp->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 			if (dp->m == NULL) {
 				device_printf(sc->sc_dev,
 				    "could not allocate rx mbuf\n");
@@ -3994,7 +3994,7 @@ urtw_rxeof(struct usb_xfer *xfer, struct urtw_data *data, int *rssi_p,
 		noise = rx->noise;
 	}
 
-	mnew = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (mnew == NULL) {
 		ifp->if_ierrors++;
 		return (NULL);
diff --git a/sys/dev/usb/wlan/if_zyd.c b/sys/dev/usb/wlan/if_zyd.c
index 0dac7ad88355..b960ce02a6fa 100644
--- a/sys/dev/usb/wlan/if_zyd.c
+++ b/sys/dev/usb/wlan/if_zyd.c
@@ -2191,9 +2191,9 @@ zyd_rx_data(struct usb_xfer *xfer, int offset, uint16_t len)
 		ifp->if_ierrors++;
 		return;
 	} else if (rlen > (int)MHLEN)
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	else
-		m = m_gethdr(M_DONTWAIT, MT_DATA);
+		m = m_gethdr(M_NOWAIT, MT_DATA);
 	if (m == NULL) {
 		DPRINTF(sc, ZYD_DEBUG_RECV, "%s: could not allocate rx mbuf\n",
 		    device_get_nameunit(sc->sc_dev));
diff --git a/sys/dev/vge/if_vge.c b/sys/dev/vge/if_vge.c
index 402a55c5e228..cdd67e0bedd3 100644
--- a/sys/dev/vge/if_vge.c
+++ b/sys/dev/vge/if_vge.c
@@ -1239,7 +1239,7 @@ vge_newbuf(struct vge_softc *sc, int prod)
 	bus_dmamap_t map;
 	int i, nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	/*
@@ -1827,7 +1827,7 @@ vge_encap(struct vge_softc *sc, struct mbuf **m_head)
 		padlen = VGE_MIN_FRAMELEN - m->m_pkthdr.len;
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -1836,7 +1836,7 @@ vge_encap(struct vge_softc *sc, struct mbuf **m_head)
 			*m_head = m;
 		}
 		if (M_TRAILINGSPACE(m) < padlen) {
-			m = m_defrag(m, M_DONTWAIT);
+			m = m_defrag(m, M_NOWAIT);
 			if (m == NULL) {
 				m_freem(*m_head);
 				*m_head = NULL;
@@ -1858,7 +1858,7 @@ vge_encap(struct vge_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->vge_cdata.vge_tx_tag,
 	    txd->tx_dmamap, *m_head, txsegs, &nsegs, 0);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, VGE_MAXTXSEGS);
+		m = m_collapse(*m_head, M_NOWAIT, VGE_MAXTXSEGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/virtio/network/if_vtnet.c b/sys/dev/virtio/network/if_vtnet.c
index e6fef9094db2..b2ebbf07716a 100644
--- a/sys/dev/virtio/network/if_vtnet.c
+++ b/sys/dev/virtio/network/if_vtnet.c
@@ -1103,7 +1103,7 @@ vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
 
 	clsize = sc->vtnet_rx_mbuf_size;
 
-	m_head = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, clsize);
+	m_head = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, clsize);
 	if (m_head == NULL)
 		goto fail;
 
@@ -1115,7 +1115,7 @@ vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
 		    ("chained Rx mbuf requested without LRO_NOMRG"));
 
 		for (i = 1; i < nbufs; i++) {
-			m = m_getjcl(M_DONTWAIT, MT_DATA, 0, clsize);
+			m = m_getjcl(M_NOWAIT, MT_DATA, 0, clsize);
 			if (m == NULL)
 				goto fail;
 
@@ -1927,7 +1927,7 @@ vtnet_enqueue_txbuf(struct vtnet_softc *sc, struct mbuf **m_head,
 		if (collapsed)
 			goto fail;
 
-		m = m_collapse(m, M_DONTWAIT, VTNET_MAX_TX_SEGS - 1);
+		m = m_collapse(m, M_NOWAIT, VTNET_MAX_TX_SEGS - 1);
 		if (m == NULL)
 			goto fail;
 
diff --git a/sys/dev/vr/if_vr.c b/sys/dev/vr/if_vr.c
index 7054042e5753..00e726909ff9 100644
--- a/sys/dev/vr/if_vr.c
+++ b/sys/dev/vr/if_vr.c
@@ -1224,7 +1224,7 @@ vr_newbuf(struct vr_softc *sc, int idx)
 	bus_dmamap_t		map;
 	int			nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1800,7 +1800,7 @@ vr_encap(struct vr_softc *sc, struct mbuf **m_head)
 	 * to copy, just do it all the time.
 	 */
 	if ((sc->vr_quirks & VR_Q_NEEDALIGN) != 0) {
-		m = m_defrag(*m_head, M_DONTWAIT);
+		m = m_defrag(*m_head, M_NOWAIT);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
@@ -1819,7 +1819,7 @@ vr_encap(struct vr_softc *sc, struct mbuf **m_head)
 		padlen = VR_MIN_FRAMELEN - m->m_pkthdr.len;
 		if (M_WRITABLE(m) == 0) {
 			/* Get a writable copy. */
-			m = m_dup(*m_head, M_DONTWAIT);
+			m = m_dup(*m_head, M_NOWAIT);
 			m_freem(*m_head);
 			if (m == NULL) {
 				*m_head = NULL;
@@ -1828,7 +1828,7 @@ vr_encap(struct vr_softc *sc, struct mbuf **m_head)
 			*m_head = m;
 		}
 		if (m->m_next != NULL || M_TRAILINGSPACE(m) < padlen) {
-			m = m_defrag(m, M_DONTWAIT);
+			m = m_defrag(m, M_NOWAIT);
 			if (m == NULL) {
 				m_freem(*m_head);
 				*m_head = NULL;
@@ -1850,7 +1850,7 @@ vr_encap(struct vr_softc *sc, struct mbuf **m_head)
 	error = bus_dmamap_load_mbuf_sg(sc->vr_cdata.vr_tx_tag, txd->tx_dmamap,
 	    *m_head, txsegs, &nsegs, BUS_DMA_NOWAIT);
 	if (error == EFBIG) {
-		m = m_collapse(*m_head, M_DONTWAIT, VR_MAXFRAGS);
+		m = m_collapse(*m_head, M_NOWAIT, VR_MAXFRAGS);
 		if (m == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;
diff --git a/sys/dev/vte/if_vte.c b/sys/dev/vte/if_vte.c
index 7865ff23b9b3..dfc06e53609a 100644
--- a/sys/dev/vte/if_vte.c
+++ b/sys/dev/vte/if_vte.c
@@ -1034,7 +1034,7 @@ vte_encap(struct vte_softc *sc, struct mbuf **m_head)
 		if (M_WRITABLE(m) == 0) {
 			if (m->m_next != NULL || padlen > 0) {
 				/* Get a writable copy. */
-				m = m_dup(*m_head, M_DONTWAIT);
+				m = m_dup(*m_head, M_NOWAIT);
 				/* Release original mbuf chains. */
 				m_freem(*m_head);
 				if (m == NULL) {
@@ -1046,7 +1046,7 @@ vte_encap(struct vte_softc *sc, struct mbuf **m_head)
 		}
 
 		if (m->m_next != NULL) {
-			m = m_defrag(*m_head, M_DONTWAIT);
+			m = m_defrag(*m_head, M_NOWAIT);
 			if (m == NULL) {
 				m_freem(*m_head);
 				*m_head = NULL;
@@ -1057,7 +1057,7 @@ vte_encap(struct vte_softc *sc, struct mbuf **m_head)
 
 		if (padlen > 0) {
 			if (M_TRAILINGSPACE(m) < padlen) {
-				m = m_defrag(*m_head, M_DONTWAIT);
+				m = m_defrag(*m_head, M_NOWAIT);
 				if (m == NULL) {
 					m_freem(*m_head);
 					*m_head = NULL;
@@ -1422,7 +1422,7 @@ vte_newbuf(struct vte_softc *sc, struct vte_rxdesc *rxd)
 	bus_dmamap_t map;
 	int nsegs;
 
-	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m == NULL)
 		return (ENOBUFS);
 	m->m_len = m->m_pkthdr.len = MCLBYTES;
@@ -1870,7 +1870,7 @@ vte_init_tx_ring(struct vte_softc *sc)
 	/* Pre-allocate TX mbufs for deep copy. */
 	if (tx_deep_copy != 0) {
 		for (i = 0; i < VTE_TX_RING_CNT; i++) {
-			sc->vte_cdata.vte_txmbufs[i] = m_getcl(M_DONTWAIT,
+			sc->vte_cdata.vte_txmbufs[i] = m_getcl(M_NOWAIT,
 			    MT_DATA, M_PKTHDR);
 			if (sc->vte_cdata.vte_txmbufs[i] == NULL)
 				return (ENOBUFS);
diff --git a/sys/dev/vx/if_vx.c b/sys/dev/vx/if_vx.c
index 090bb0c5c9e7..acb9c2fb3123 100644
--- a/sys/dev/vx/if_vx.c
+++ b/sys/dev/vx/if_vx.c
@@ -811,7 +811,7 @@ vx_get(struct vx_softc *sc, u_int totlen)
 	m = sc->vx_mb[sc->vx_next_mb];
 	sc->vx_mb[sc->vx_next_mb] = NULL;
 	if (m == NULL) {
-		MGETHDR(m, M_DONTWAIT, MT_DATA);
+		MGETHDR(m, M_NOWAIT, MT_DATA);
 		if (m == NULL)
 			return NULL;
 	} else {
@@ -853,7 +853,7 @@ vx_get(struct vx_softc *sc, u_int totlen)
 			m = sc->vx_mb[sc->vx_next_mb];
 			sc->vx_mb[sc->vx_next_mb] = NULL;
 			if (m == NULL) {
-				MGET(m, M_DONTWAIT, MT_DATA);
+				MGET(m, M_NOWAIT, MT_DATA);
 				if (m == NULL) {
 					m_freem(top);
 					return NULL;
@@ -864,7 +864,7 @@ vx_get(struct vx_softc *sc, u_int totlen)
 			len = MLEN;
 		}
 		if (totlen >= MINCLSIZE) {
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if (m->m_flags & M_EXT)
 				len = MCLBYTES;
 		}
@@ -1044,7 +1044,7 @@ vx_mbuf_fill(void *sp)
 	i = sc->vx_last_mb;
 	do {
 		if (sc->vx_mb[i] == NULL)
-			MGET(sc->vx_mb[i], M_DONTWAIT, MT_DATA);
+			MGET(sc->vx_mb[i], M_NOWAIT, MT_DATA);
 		if (sc->vx_mb[i] == NULL)
 			break;
 		i = (i + 1) % MAX_MBS;
diff --git a/sys/dev/vxge/vxge.c b/sys/dev/vxge/vxge.c
index 9948801a5443..c35d84bb8404 100644
--- a/sys/dev/vxge/vxge.c
+++ b/sys/dev/vxge/vxge.c
@@ -1192,7 +1192,7 @@ vxge_rx_rxd_1b_set(vxge_vpath_t *vpath, vxge_hal_rxd_h rxdh, void *dtr_priv)
 
 	vxge_dev_t *vdev = vpath->vdev;
 
-	mbuf_pkt = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, vdev->rx_mbuf_sz);
+	mbuf_pkt = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, vdev->rx_mbuf_sz);
 	if (!mbuf_pkt) {
 		err = ENOBUFS;
 		VXGE_DRV_STATS(vpath, rx_no_buf);
@@ -3011,7 +3011,7 @@ vxge_dma_mbuf_coalesce(bus_dma_tag_t dma_tag_tx, bus_dmamap_t dma_map,
 	    dma_buffers, num_segs, BUS_DMA_NOWAIT);
 	if (err == EFBIG) {
 		/* try to defrag, too many segments */
-		mbuf_pkt = m_defrag(*m_headp, M_DONTWAIT);
+		mbuf_pkt = m_defrag(*m_headp, M_NOWAIT);
 		if (mbuf_pkt == NULL) {
 			err = ENOBUFS;
 			goto _exit0;
diff --git a/sys/dev/wb/if_wb.c b/sys/dev/wb/if_wb.c
index 0d0dd5599746..8bc28eabcf01 100644
--- a/sys/dev/wb/if_wb.c
+++ b/sys/dev/wb/if_wb.c
@@ -842,7 +842,7 @@ wb_newbuf(sc, c, m)
 	struct mbuf		*m_new = NULL;
 
 	if (m == NULL) {
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL)
 			return(ENOBUFS);
 		m_new->m_data = c->wb_buf;
@@ -1192,11 +1192,11 @@ wb_encap(sc, c, m_head)
 	if (m != NULL) {
 		struct mbuf		*m_new = NULL;
 
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL)
 			return(1);
 		if (m_head->m_pkthdr.len > MHLEN) {
-			MCLGET(m_new, M_DONTWAIT);
+			MCLGET(m_new, M_NOWAIT);
 			if (!(m_new->m_flags & M_EXT)) {
 				m_freem(m_new);
 				return(1);
diff --git a/sys/dev/wi/if_wi.c b/sys/dev/wi/if_wi.c
index cae3b6fe841f..2ca3c8cf8fa1 100644
--- a/sys/dev/wi/if_wi.c
+++ b/sys/dev/wi/if_wi.c
@@ -1360,9 +1360,9 @@ wi_rx_intr(struct wi_softc *sc)
 	}
 
 	if (off + len > MHLEN)
-		m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+		m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	else
-		m = m_gethdr(M_DONTWAIT, MT_DATA);
+		m = m_gethdr(M_NOWAIT, MT_DATA);
 	if (m == NULL) {
 		CSR_WRITE_2(sc, WI_EVENT_ACK, WI_EV_RX);
 		ifp->if_ierrors++;
diff --git a/sys/dev/wl/if_wl.c b/sys/dev/wl/if_wl.c
index a95997e4225e..c6db4b9f15ae 100644
--- a/sys/dev/wl/if_wl.c
+++ b/sys/dev/wl/if_wl.c
@@ -1094,7 +1094,7 @@ wlread(struct wl_softc *sc, u_short fd_p)
     /*
      * Allocate a cluster'd mbuf to receive the packet.
      */
-    m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+    m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
     if (m == NULL) {
 	if (wlhwrst(sc) != TRUE) {
 	    sc->hacr &= ~HACR_INTRON;
diff --git a/sys/dev/wpi/if_wpi.c b/sys/dev/wpi/if_wpi.c
index 365e03e4d36e..465c140d1d86 100644
--- a/sys/dev/wpi/if_wpi.c
+++ b/sys/dev/wpi/if_wpi.c
@@ -989,7 +989,7 @@ wpi_alloc_rx_ring(struct wpi_softc *sc, struct wpi_rx_ring *ring)
 			    __func__, error);
 			goto fail;
 		}
-		m = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
+		m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
 		if (m == NULL) {
 			device_printf(sc->sc_dev,
 			   "%s: could not allocate rx mbuf\n", __func__);
@@ -1493,7 +1493,7 @@ wpi_rx_intr(struct wpi_softc *sc, struct wpi_rx_desc *desc,
 	}
 
 	/* XXX don't need mbuf, just dma buffer */
-	mnew = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
+	mnew = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
 	if (mnew == NULL) {
 		DPRINTFN(WPI_DEBUG_RX, ("%s: no mbuf to restock ring\n",
 		    __func__));
@@ -1975,7 +1975,7 @@ wpi_tx_data(struct wpi_softc *sc, struct mbuf *m0, struct ieee80211_node *ni,
 	}
 	if (error != 0) {
 		/* XXX use m_collapse */
-		mnew = m_defrag(m0, M_DONTWAIT);
+		mnew = m_defrag(m0, M_NOWAIT);
 		if (mnew == NULL) {
 			device_printf(sc->sc_dev,
 			    "could not defragment mbuf\n");
@@ -2575,7 +2575,7 @@ wpi_scan(struct wpi_softc *sc)
 	desc = &ring->desc[ring->cur];
 	data = &ring->data[ring->cur];
 
-	data->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	data->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (data->m == NULL) {
 		device_printf(sc->sc_dev,
 		    "could not allocate mbuf for scan command\n");
diff --git a/sys/dev/wtap/if_wtap.c b/sys/dev/wtap/if_wtap.c
index 6adc5b328e48..1a77274de2f0 100644
--- a/sys/dev/wtap/if_wtap.c
+++ b/sys/dev/wtap/if_wtap.c
@@ -100,7 +100,7 @@ wtap_node_write(struct cdev *dev, struct uio *uio, int ioflag)
 		return (err);
 	}
 
-	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	MGETHDR(m, M_NOWAIT, MT_DATA);
 	m_copyback(m, 0, buf_len, buf);
 
 	CURVNET_SET(TD_TO_VNET(curthread));
@@ -241,7 +241,7 @@ wtap_beacon_intrp(void *arg)
 	 * the beacon frame changed size (probably because
 	 * of the TIM bitmap).
 	 */
-	m = m_dup(avp->beacon, M_DONTWAIT);
+	m = m_dup(avp->beacon, M_NOWAIT);
 	if (ieee80211_beacon_update(avp->bf_node, &avp->av_boff, m, 0)) {
 		printf("%s, need to remap the memory because the beacon frame"
 		    " changed size.\n",__func__);
diff --git a/sys/dev/wtap/plugins/visibility.c b/sys/dev/wtap/plugins/visibility.c
index 9d2624cf8a31..a73d5203200f 100644
--- a/sys/dev/wtap/plugins/visibility.c
+++ b/sys/dev/wtap/plugins/visibility.c
@@ -151,7 +151,7 @@ visibility_work(struct wtap_plugin *plugin, struct packet *p)
 					struct wtap_softc *sc =
 					    hal->hal_devs[k];
 					struct mbuf *m =
-					    m_dup(p->m, M_DONTWAIT);
+					    m_dup(p->m, M_NOWAIT);
 					DWTAP_PRINTF("[%d] duplicated old_m=%p"
 					    "to new_m=%p\n", p->id, p->m, m);
 #if 0
diff --git a/sys/dev/xe/if_xe.c b/sys/dev/xe/if_xe.c
index 57411bac7f1e..855c8c166433 100644
--- a/sys/dev/xe/if_xe.c
+++ b/sys/dev/xe/if_xe.c
@@ -757,14 +757,14 @@ xe_rxintr(struct xe_softc *scp, uint8_t rst0)
 			 * read 16-bit words).  XXX - Surely there's a
 			 * better way to do this alignment?
 			 */
-			MGETHDR(mbp, M_DONTWAIT, MT_DATA);
+			MGETHDR(mbp, M_NOWAIT, MT_DATA);
 			if (mbp == NULL) {
 				ifp->if_iqdrops++;
 				continue;
 			}
 
 			if (len + 3 > MHLEN) {
-				MCLGET(mbp, M_DONTWAIT);
+				MCLGET(mbp, M_NOWAIT);
 				if ((mbp->m_flags & M_EXT) == 0) {
 					m_freem(mbp);
 					ifp->if_iqdrops++;
diff --git a/sys/dev/xen/netfront/netfront.c b/sys/dev/xen/netfront/netfront.c
index 7dd5639881bf..856c98885aa2 100644
--- a/sys/dev/xen/netfront/netfront.c
+++ b/sys/dev/xen/netfront/netfront.c
@@ -831,13 +831,13 @@ network_alloc_rx_buffers(struct netfront_info *sc)
 	 */
 	batch_target = sc->rx_target - (req_prod - sc->rx.rsp_cons);
 	for (i = mbufq_len(&sc->xn_rx_batch); i < batch_target; i++) {
-		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		MGETHDR(m_new, M_NOWAIT, MT_DATA);
 		if (m_new == NULL) {
 			printf("%s: MGETHDR failed\n", __func__);
 			goto no_mbuf;
 		}
 
-		m_cljget(m_new, M_DONTWAIT, MJUMPAGESIZE);
+		m_cljget(m_new, M_NOWAIT, MJUMPAGESIZE);
 		if ((m_new->m_flags & M_EXT) == 0) {
 			printf("%s: m_cljget failed\n", __func__);
 			m_freem(m_new);
@@ -1530,7 +1530,7 @@ xn_assemble_tx_request(struct netfront_info *sc, struct mbuf *m_head)
 	 * the Linux network stack.
 	 */
 	if (nfrags > sc->maxfrags) {
-		m = m_defrag(m_head, M_DONTWAIT);
+		m = m_defrag(m_head, M_NOWAIT);
 		if (!m) {
 			/*
 			 * Defrag failed, so free the mbuf and
diff --git a/sys/dev/xl/if_xl.c b/sys/dev/xl/if_xl.c
index 7b2e23fb45eb..90bc0c02cef5 100644
--- a/sys/dev/xl/if_xl.c
+++ b/sys/dev/xl/if_xl.c
@@ -1762,7 +1762,7 @@ xl_newbuf(struct xl_softc *sc, struct xl_chain_onefrag *c)
 
 	XL_LOCK_ASSERT(sc);
 
-	m_new = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	m_new = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
 	if (m_new == NULL)
 		return (ENOBUFS);
 
@@ -2358,7 +2358,7 @@ xl_encap(struct xl_softc *sc, struct xl_chain *c, struct mbuf **m_head)
 	 * and would waste cycles.
 	 */
 	if (error) {
-		m_new = m_collapse(*m_head, M_DONTWAIT, XL_MAXFRAGS);
+		m_new = m_collapse(*m_head, M_NOWAIT, XL_MAXFRAGS);
 		if (m_new == NULL) {
 			m_freem(*m_head);
 			*m_head = NULL;