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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 /mm/rmap.c
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 'mm/rmap.c')
-rw-r--r--mm/rmap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index dfbb89f99a15..d85a99d28c03 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -33,7 +33,7 @@
* mapping->i_mmap_lock
* anon_vma->lock
* mm->page_table_lock or pte_lock
- * zone->lru_lock (in mark_page_accessed)
+ * zone->lru_lock (in mark_page_accessed, isolate_lru_page)
* swap_lock (in swap_duplicate, swap_info_get)
* mmlist_lock (in mmput, drain_mmlist and others)
* mapping->private_lock (in __set_page_dirty_buffers)