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MFi386 r1.369

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- Clear the PG_WRITEABLE flag in pmap_page_protect() if write access is
   being removed.  Return immediately if write access is being removed and
   PG_WRITEABLE is already clear.
This commit is contained in:
Alan Cox 2002-11-17 21:48:42 +00:00
parent e66b2829eb
commit 779df20df2
1 changed files with 3 additions and 0 deletions
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3
sys/ia64/ia64/pmap.c
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@ -2213,6 +2213,8 @@ pmap_page_protect(vm_page_t m, vm_prot_t prot)
if ((prot & VM_PROT_WRITE) != 0)
return;
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if ((m->flags & PG_WRITEABLE) == 0)
return;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
int newprot = pte_prot(pv->pv_pmap, prot);
pmap_t oldpmap = pmap_install(pv->pv_pmap);
@ -2223,6 +2225,7 @@ pmap_page_protect(vm_page_t m, vm_prot_t prot)
pmap_invalidate_page(pv->pv_pmap, pv->pv_va);
pmap_install(oldpmap);
}
vm_page_flag_clear(m, PG_WRITEABLE);
} else {
pmap_remove_all(m);
}