* [patch 6/8] mm: debug check for the fault vs invalidate race
@ 2007-05-18 7:37 akpm, Nick Piggin
0 siblings, 0 replies; only message in thread
From: akpm, Nick Piggin @ 2007-05-18 7:37 UTC (permalink / raw)
To: torvalds; +Cc: linux-mm, akpm, npiggin
Add a bugcheck for Andrea's pagefault vs invalidate race. This is triggerable
for both linear and nonlinear pages with a userspace test harness (using
direct IO and truncate, respectively).
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/filemap.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/filemap.c~mm-debug-check-for-the-fault-vs-invalidate-race mm/filemap.c
--- a/mm/filemap.c~mm-debug-check-for-the-fault-vs-invalidate-race
+++ a/mm/filemap.c
@@ -120,6 +120,7 @@ void __remove_from_page_cache(struct pag
page->mapping = NULL;
mapping->nrpages--;
__dec_zone_page_state(page, NR_FILE_PAGES);
+ BUG_ON(page_mapped(page));
}
void remove_from_page_cache(struct page *page)
_
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