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Addendum to the previous revision: If vm_page_alloc() for the page

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table page fails, perform a VM_WAIT; update some comments in
_pmap_allocpte().
This commit is contained in:
Alan Cox 2003-09-27 05:44:53 +00:00
parent 67425e4678
commit 4487ff65db
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120499
1 changed files with 10 additions and 5 deletions
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15
sys/i386/i386/pmap.c
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@ -1178,12 +1178,17 @@ _pmap_allocpte(pmap, ptepindex)
vm_page_t m;
/*
* Find or fabricate a new pagetable page
* Allocate a page table page.
*/
m = vm_page_alloc(NULL, ptepindex,
VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_NOOBJ);
if (m == NULL)
return (m);
if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ |
VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) {
VM_WAIT;
/*
* Indicate the need to retry. While waiting, the page table
* page may have been allocated.
*/
return (NULL);
}
if ((m->flags & PG_ZERO) == 0)
pmap_zero_page(m);