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From 485e57ba23f41cf6fccbd389f8f277c3121c3b65 Mon Sep 17 00:00:00 2001
From: Gregory Haskins <ghaskins@novell.com>
Date: Fri, 3 Jul 2009 08:44:22 -0500
Subject: [PATCH] rtmutex: Remove the extra call to try_to_take_lock
commit 73d33cafab165763a64e0e6f1f842193fff4b18c in tip.
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From: Peter W. Morreale <pmorreale@novell.com>
Remove the redundant attempt to get the lock. While it is true that the
exit path with this patch adds an un-necessary xchg (in the event the
lock is granted without further traversal in the loop) experimentation
shows that we almost never encounter this situation.
Signed-off-by: Peter W. Morreale <pmorreale@novell.com>
Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
kernel/rtmutex.c | 6 ------
1 files changed, 0 insertions(+), 6 deletions(-)
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 5017ecb..f4c5cde 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -775,12 +775,6 @@ rt_spin_lock_slowlock(struct rt_mutex *lock)
raw_spin_lock_irqsave(&lock->wait_lock, flags);
init_lists(lock);
- /* Try to acquire the lock again: */
- if (do_try_to_take_rt_mutex(lock, STEAL_LATERAL)) {
- raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
- return;
- }
-
BUG_ON(rt_mutex_owner(lock) == current);
/*
--
1.7.0.4
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