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authorNick Piggin <npiggin@suse.de>2006-01-18 17:42:27 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-18 19:20:17 -0800
commit053837fce7aa79025ed57656855df09f80175527 (patch)
tree05d7615894131a368fc4943f641b11acdd2ae694 /include/linux
parente236a166b2bc437769a9b8b5d19186a3761bde48 (diff)
[PATCH] mm: migration page refcounting fix
Migration code currently does not take a reference to target page properly, so between unlocking the pte and trying to take a new reference to the page with isolate_lru_page, anything could happen to it. Fix this by holding the pte lock until we get a chance to elevate the refcount. Other small cleanups while we're here. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/mm_inline.h21
-rw-r--r--include/linux/swap.h1
2 files changed, 1 insertions, 21 deletions
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 49cc68af01f..8ac854f7f19 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -39,24 +39,3 @@ del_page_from_lru(struct zone *zone, struct page *page)
}
}
-/*
- * Isolate one page from the LRU lists.
- *
- * - zone->lru_lock must be held
- */
-static inline int __isolate_lru_page(struct page *page)
-{
- if (unlikely(!TestClearPageLRU(page)))
- return 0;
-
- if (get_page_testone(page)) {
- /*
- * It is being freed elsewhere
- */
- __put_page(page);
- SetPageLRU(page);
- return -ENOENT;
- }
-
- return 1;
-}
diff --git a/include/linux/swap.h b/include/linux/swap.h
index e92054d6530..d01f7efb0f2 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -167,6 +167,7 @@ extern void FASTCALL(lru_cache_add_active(struct page *));
extern void FASTCALL(activate_page(struct page *));
extern void FASTCALL(mark_page_accessed(struct page *));
extern void lru_add_drain(void);
+extern int lru_add_drain_all(void);
extern int rotate_reclaimable_page(struct page *page);
extern void swap_setup(void);