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| author | Nick Piggin <npiggin@suse.de> | 2007-05-16 22:11:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-17 05:23:06 -0700 |
| commit | c97a9e10eaee328e6eea9f76acf7bacd7d48ef56 (patch) | |
| tree | f14bf796d087e130452a2e2457c75eb1eca27483 /include/linux | |
| parent | ea125892a17f43919c726777ed1e4929d41e7984 (diff) | |
| download | linux-c97a9e10eaee328e6eea9f76acf7bacd7d48ef56.tar.gz linux-c97a9e10eaee328e6eea9f76acf7bacd7d48ef56.tar.bz2 linux-c97a9e10eaee328e6eea9f76acf7bacd7d48ef56.zip | |
mm: more rmap checking
Re-introduce rmap verification patches that Hugh removed when he removed
PG_map_lock. PG_map_lock actually isn't needed to synchronise access to
anonymous pages, because PG_locked and PTL together already do.
These checks were important in discovering and fixing a rare rmap corruption
in SLES9.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rmap.h | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index bdd277223af0..97347f22fc20 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -74,17 +74,14 @@ void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned lon void page_add_file_rmap(struct page *); void page_remove_rmap(struct page *, struct vm_area_struct *); -/** - * page_dup_rmap - duplicate pte mapping to a page - * @page: the page to add the mapping to - * - * For copy_page_range only: minimal extract from page_add_rmap, - * avoiding unnecessary tests (already checked) so it's quicker. - */ -static inline void page_dup_rmap(struct page *page) +#ifdef CONFIG_DEBUG_VM +void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address); +#else +static inline void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { atomic_inc(&page->_mapcount); } +#endif /* * Called from mm/vmscan.c to handle paging out |