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mm: debug check for the fault vs invalidate race

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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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
2007-07-15 23:38:12 -07:00
committed by Linus Torvalds
parent f96efd585b
commit 45426812d6
1 changed files with 1 additions and 0 deletions
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mm/filemap.c
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@@ -120,6 +120,7 @@ void __remove_from_page_cache(struct page *page)
page->mapping = NULL; page->mapping = NULL;
mapping->nrpages--; mapping->nrpages--;
__dec_zone_page_state(page, NR_FILE_PAGES); __dec_zone_page_state(page, NR_FILE_PAGES);
BUG_ON(page_mapped(page));
} }
void remove_from_page_cache(struct page *page) void remove_from_page_cache(struct page *page)