From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Wed, 2 Dec 2009 19:49:17 +0000 (+0100)
Subject: mutex: Fix missing conditions to build mutex_spin_on_owner()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c08f782985eed9959438368e84ce1d7f2ed03d95;p=openwrt%2Fstaging%2Fblogic.git

mutex: Fix missing conditions to build mutex_spin_on_owner()

We don't need to build mutex_spin_on_owner() if we have
CONFIG_DEBUG_MUTEXES or CONFIG_HAVE_DEFAULT_NO_SPIN_MUTEXES as
it won't be used under such configs.

Use CONFIG_MUTEX_SPIN_ON_OWNER as it gathers all the necessary
checks before building it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1259783357-8542-2-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index 3c11ae0a948d..ec0af1fcb195 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5481,7 +5481,7 @@ need_resched_nonpreemptible:
 }
 EXPORT_SYMBOL(schedule);
 
-#ifdef CONFIG_SMP
+#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
 /*
  * Look out! "owner" is an entirely speculative pointer
  * access and not reliable.