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authorFrederic Weisbecker <fweisbec@gmail.com>2009-12-02 20:49:16 +0100
committerIngo Molnar <mingo@elte.hu>2009-12-03 11:50:11 +0100
commitc02260277e472095ffb3ad893be5eeab9dcefde3 (patch)
tree583bb881a47b02cf345c557722696e96f609e690
parentfa1452e808732ae10e8b1267fd75fc2d028d634b (diff)
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mutex: Better control mutex adaptive spinning config
Introduce CONFIG_MUTEX_SPIN_ON_OWNER so that we can centralize in a single place the conditions that determine its definition and use. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <1259783357-8542-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org>
-rw-r--r--kernel/Kconfig.locks3
-rw-r--r--kernel/mutex.c4
2 files changed, 5 insertions, 2 deletions
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index d1f86db7145..88c92fb4461 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -197,3 +197,6 @@ config INLINE_WRITE_UNLOCK_IRQ
config INLINE_WRITE_UNLOCK_IRQRESTORE
def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
+
+config MUTEX_SPIN_ON_OWNER
+ def_bool SMP && !DEBUG_MUTEXES && !HAVE_DEFAULT_NO_SPIN_MUTEXES
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 947b3ad551f..632f04c57d8 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -148,8 +148,8 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
preempt_disable();
mutex_acquire(&lock->dep_map, subclass, 0, ip);
-#if defined(CONFIG_SMP) && !defined(CONFIG_DEBUG_MUTEXES) && \
- !defined(CONFIG_HAVE_DEFAULT_NO_SPIN_MUTEXES)
+
+#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
/*
* Optimistic spinning.
*