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| author | Konstantin Khlebnikov <khlebnikov@openvz.org> | 2011-07-25 17:12:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-25 20:57:11 -0700 |
| commit | 72c4783210f77fd743f0a316858d33f27db51e7c (patch) | |
| tree | 4efc95eb0aaade090bac42e72c5973ada6d2cdb1 | |
| parent | 76d3fbf8fbf6cc78ceb63549e0e0c5bc8a88f838 (diff) | |
| download | blackbird-op-linux-72c4783210f77fd743f0a316858d33f27db51e7c.tar.gz blackbird-op-linux-72c4783210f77fd743f0a316858d33f27db51e7c.zip | |
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.c | 6 |
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); |
