From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 23 Aug 2016 11:45:15 +0000 (+0200)
Subject: locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a3ea3d9b865c2a8f7fe455c7fa26db4b6fd066e3;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES

Now that mutex::count and mutex::owner are the same field, we can
allow SPIN_ON_OWNER while DEBUG_MUTEX.

Tested-by: Jason Low <jason.low2@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index ebdb0043203a..84d882f3e299 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -225,7 +225,7 @@ config ARCH_SUPPORTS_ATOMIC_RMW
 
 config MUTEX_SPIN_ON_OWNER
 	def_bool y
-	depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW
+	depends on SMP && ARCH_SUPPORTS_ATOMIC_RMW
 
 config RWSEM_SPIN_ON_OWNER
        def_bool y