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Correct a long-standing race condition in vm_fault() that could result in a

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panic "vm_page_cache: caching a dirty page, ...": Access to the page must
be restricted or removed before calling vm_page_cache().  This race
condition is identical in nature to that which was addressed by
vm_pageout.c's revision 1.251 and vm_page.c's revision 1.275.

Reviewed by:	tegge
MFC after:	7 days
This commit is contained in:
Alan Cox 2004-02-15 00:42:26 +00:00
parent 862bba7a70
commit c6d9ef2e1f
1 changed files with 1 additions and 3 deletions
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4
sys/vm/vm_fault.c
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@ -488,10 +488,8 @@ readrest:
mt->hold_count || mt->hold_count ||
mt->wire_count) mt->wire_count)
continue; continue;
if (mt->dirty == 0) pmap_remove_all(mt);
vm_page_test_dirty(mt);
if (mt->dirty) { if (mt->dirty) {
pmap_remove_all(mt);
vm_page_deactivate(mt); vm_page_deactivate(mt);
} else { } else {
vm_page_cache(mt); vm_page_cache(mt);