- Correct a long-standing race condition in vm_page_try_to_cache() that

   could result in a 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.
 - Simplify the code surrounding the fix to this same race condition
   in vm_pageout.c's revision 1.251.  There should be no behavioral
   change.  Reviewed by: tegge

MFC after:	7 days

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 21103b3..9bc15fe 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -1292,7 +1292,7 @@ vm_page_try_to_cache(vm_page_t m)
 	    (m->flags & (PG_BUSY|PG_UNMANAGED))) {
 		return (0);
 	}
-	vm_page_test_dirty(m);
+	pmap_remove_all(m);
 	if (m->dirty)
 		return (0);
 	vm_page_cache(m);