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Code Issues Releases Activity

In pmap_page_protect, clear the vm page's PG_WRITEABLE flag if

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downgrading to read-only. Found by triggering the KASSERT in
vm_pageout_flush().
This commit is contained in:
Peter Grehan 2004-08-05 12:44:12 +00:00
parent cfe632eaba
commit 2184ddd1f7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=133166
3 changed files with 21 additions and 3 deletions
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8
sys/powerpc/aim/mmu_oea.c
View File

@ -1350,6 +1350,12 @@ pmap_page_protect(vm_page_t m, vm_prot_t prot)
pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PMAP_PVO_CHECK(pvo); /* sanity check */
}
/*
* Downgrading from writeable: clear the VM page flag
*/
if ((prot & VM_PROT_WRITE) != VM_PROT_WRITE)
vm_page_flag_clear(m, PG_WRITEABLE);
}
/*
@ -1583,7 +1589,7 @@ pmap_remove_all(vm_page_t m)
pvo_head = vm_page_to_pvoh(m);
for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) {
next_pvo = LIST_NEXT(pvo, pvo_vlink);
PMAP_PVO_CHECK(pvo); /* sanity check */
pmap_pvo_remove(pvo, -1);
}

8
sys/powerpc/powerpc/mmu_oea.c
View File

@ -1350,6 +1350,12 @@ pmap_page_protect(vm_page_t m, vm_prot_t prot)
pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PMAP_PVO_CHECK(pvo); /* sanity check */
}
/*
* Downgrading from writeable: clear the VM page flag
*/
if ((prot & VM_PROT_WRITE) != VM_PROT_WRITE)
vm_page_flag_clear(m, PG_WRITEABLE);
}
/*
@ -1583,7 +1589,7 @@ pmap_remove_all(vm_page_t m)
pvo_head = vm_page_to_pvoh(m);
for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) {
next_pvo = LIST_NEXT(pvo, pvo_vlink);
PMAP_PVO_CHECK(pvo); /* sanity check */
pmap_pvo_remove(pvo, -1);
}

8
sys/powerpc/powerpc/pmap.c
View File

@ -1350,6 +1350,12 @@ pmap_page_protect(vm_page_t m, vm_prot_t prot)
pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr);
PMAP_PVO_CHECK(pvo); /* sanity check */
}
/*
* Downgrading from writeable: clear the VM page flag
*/
if ((prot & VM_PROT_WRITE) != VM_PROT_WRITE)
vm_page_flag_clear(m, PG_WRITEABLE);
}
/*
@ -1583,7 +1589,7 @@ pmap_remove_all(vm_page_t m)
pvo_head = vm_page_to_pvoh(m);
for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) {
next_pvo = LIST_NEXT(pvo, pvo_vlink);
PMAP_PVO_CHECK(pvo); /* sanity check */
pmap_pvo_remove(pvo, -1);
}