linux-kernel - [PATCH 18/29] locking, tsx: Abort is mutex_is

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Message-Id: <1364001923-10796-19-git-send-email-andi@firstfloor.org>
Date:	Fri, 22 Mar 2013 18:25:12 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	x86@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 18/29] locking, tsx: Abort is mutex_is_locked()

From: Andi Kleen <ak@...ux.intel.com>

Inside a elided mutex we cannot tell if the mutex is really locked
or not. Aborting it he safe answer.

Callers who frequently abort (e.g. BUG_ONs) need to be fixed
separately.

Noop without RTM.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 include/linux/mutex.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 9121595..0574095 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -14,6 +14,7 @@
 #include <linux/spinlock_types.h>
 #include <linux/linkage.h>
 #include <linux/lockdep.h>
+#include <linux/elide.h>
 
 #include <linux/atomic.h>
 
@@ -123,6 +124,7 @@ extern void __mutex_init(struct mutex *lock, const char *name,
  */
 static inline int mutex_is_locked(struct mutex *lock)
 {
+	elide_abort();
 	return atomic_read(&lock->count) != 1;
 }
 
-- 
1.7.7.6

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