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When INVARIANTS is defined make sure that uma_zalloc_arg (and hence

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uma_zalloc) is called with exactly one of either M_WAITOK or M_NOWAIT and
that it is called with neither M_TRYWAIT or M_DONTWAIT. Print a warning
if anything is wrong. Default to M_WAITOK of no flag is given. This is the
same test as in malloc(9).
This commit is contained in:
Hartmut Brandt 2003-07-18 16:04:36 +00:00
parent def6489df6
commit 8522511b2a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=117736
1 changed files with 20 additions and 0 deletions
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20
sys/vm/uma_core.c
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@ -68,6 +68,7 @@ __FBSDID("$FreeBSD$");
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/vmmeter.h>
#include <sys/mbuf.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
@ -1320,6 +1321,25 @@ uma_zalloc_arg(uma_zone_t zone, void *udata, int flags)
printf("Allocating one item from %s(%p)\n", zone->uz_name, zone);
#endif
#ifdef INVARIANTS
/*
* To make sure that WAITOK or NOWAIT is set, but not more than
* one, and check against the API botches that are common.
* The uma code implies M_WAITOK if M_NOWAIT is not set, so
* we default to waiting if none of the flags is set.
*/
cpu = flags & (M_WAITOK | M_NOWAIT | M_DONTWAIT | M_TRYWAIT);
if (cpu != M_NOWAIT && cpu != M_WAITOK) {
static struct timeval lasterr;
static int curerr, once;
if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
printf("Bad uma_zalloc flags: %x\n", cpu);
backtrace();
once++;
}
}
#endif
if (!(flags & M_NOWAIT)) {
KASSERT(curthread->td_intr_nesting_level == 0,
("malloc(M_WAITOK) in interrupt context"));