[patch 1/6] mm: debug check for the fault vs invalidate race

From: Nick Piggin
Date: Tue Feb 20 2007 - 23:50:38 EST

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@xxxxxxx>

mm/filemap.c | 2 ++
1 file changed, 2 insertions(+)

Index: linux-2.6/mm/filemap.c
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -120,6 +120,8 @@ void __remove_from_page_cache(struct pag
page->mapping = NULL;
__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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