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authorNamhyung Kim <namhyung@gmail.com>2010-10-26 14:22:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:09 -0700
commitea4525b6008fb29553306ec6719f8e6930ac9499 (patch)
tree1d168e0a05a5f2fc962b8a6e991a21b704ad6e0b /mm
parent1b36ba815bd91f17e31277a44dd5c6b6a5a8d97e (diff)
downloadvexpress-lsk-ea4525b6008fb29553306ec6719f8e6930ac9499.tar.gz
rmap: annotate lock context change on page_[un]lock_anon_vma()
The page_lock_anon_vma() conditionally grabs RCU and anon_vma lock but page_unlock_anon_vma() releases them unconditionally. This leads sparse to complain about context imbalance. Annotate them. Signed-off-by: Namhyung Kim <namhyung@gmail.com> 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/rmap.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index f5ad996a4a8..0995a8f6886 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -314,7 +314,7 @@ void __init anon_vma_init(void)
* Getting a lock on a stable anon_vma from a page off the LRU is
* tricky: page_lock_anon_vma rely on RCU to guard against the races.
*/
-struct anon_vma *page_lock_anon_vma(struct page *page)
+struct anon_vma *__page_lock_anon_vma(struct page *page)
{
struct anon_vma *anon_vma, *root_anon_vma;
unsigned long anon_mapping;
@@ -348,6 +348,8 @@ out:
}
void page_unlock_anon_vma(struct anon_vma *anon_vma)
+ __releases(&anon_vma->root->lock)
+ __releases(RCU)
{
anon_vma_unlock(anon_vma);
rcu_read_unlock();