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| author | Nick Piggin <npiggin@suse.de> | 2007-07-15 23:38:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:35 -0700 |
| commit | 45426812d6b601430d560cb6049757b5b0bc71c4 (patch) | |
| tree | 64c8439a53f4ca402a9d7deb2a455aa0de08c8ea /mm | |
| parent | f96efd585b8d847181f81bf16721f96ded18d9fe (diff) | |
| download | linux-45426812d6b601430d560cb6049757b5b0bc71c4.tar.gz linux-45426812d6b601430d560cb6049757b5b0bc71c4.tar.bz2 linux-45426812d6b601430d560cb6049757b5b0bc71c4.zip | |
mm: debug check for the fault vs invalidate race
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/filemap.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index c6ebd9f912ab..e006c57bda54 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -120,6 +120,7 @@ void __remove_from_page_cache(struct page *page) 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) |