linux-kernel - [PATCH] mm: remove useless rcu lock-unlock from mapping

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Date:	Sun, 17 Jul 2011 15:35:23 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: remove useless rcu lock-unlock from mapping_tagged()

radix_tree_tagged() is lockless, it does not require any protection.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 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 31f6988..919b45e 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);

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