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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 /include
parent1b36ba815bd91f17e31277a44dd5c6b6a5a8d97e (diff)
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 'include')
-rw-r--r--include/linux/rmap.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 5c98df68a953..07ea89c16761 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -230,7 +230,20 @@ int try_to_munlock(struct page *);
/*
* Called by memory-failure.c to kill processes.
*/
-struct anon_vma *page_lock_anon_vma(struct page *page);
+struct anon_vma *__page_lock_anon_vma(struct page *page);
+
+static inline struct anon_vma *page_lock_anon_vma(struct page *page)
+{
+ struct anon_vma *anon_vma;
+
+ __cond_lock(RCU, anon_vma = __page_lock_anon_vma(page));
+
+ /* (void) is needed to make gcc happy */
+ (void) __cond_lock(&anon_vma->root->lock, anon_vma);
+
+ return anon_vma;
+}
+
void page_unlock_anon_vma(struct anon_vma *anon_vma);
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);