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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2011-07-25 17:12:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-25 20:57:11 -0700
commit72c4783210f77fd743f0a316858d33f27db51e7c (patch)
tree4efc95eb0aaade090bac42e72c5973ada6d2cdb1
parent76d3fbf8fbf6cc78ceb63549e0e0c5bc8a88f838 (diff)
mm: remove useless rcu lock-unlock from mapping_tagged()
radix_tree_tagged() is lockless - it reads from a member of the raid-tree root node. It does not require any protection. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/page-writeback.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 31f698862420..919b45eb57ad 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1405,10 +1405,6 @@ EXPORT_SYMBOL(test_set_page_writeback);
*/
int mapping_tagged(struct address_space *mapping, int tag)
{
- int ret;
- rcu_read_lock();
- ret = radix_tree_tagged(&mapping->page_tree, tag);
- rcu_read_unlock();
- return ret;
+ return radix_tree_tagged(&mapping->page_tree, tag);
}
EXPORT_SYMBOL(mapping_tagged);