linux-kernel - [patch V4 11/68] rtmutex: Switch to try

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Date:   Wed, 11 Aug 2021 14:22:44 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>,
        Mike Galbraith <efault@....de>
Subject: [patch V4 11/68] rtmutex: Switch to try_cmpxchg()

From: Thomas Gleixner <tglx@...utronix.de>

Allows the compiler to generate better code depending on the architecture.

Suggested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/locking/rtmutex.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -145,14 +145,14 @@ static __always_inline bool rt_mutex_cmp
 						     struct task_struct *old,
 						     struct task_struct *new)
 {
-	return cmpxchg_acquire(&lock->owner, old, new) == old;
+	return try_cmpxchg_acquire(&lock->owner, &old, new);
 }
 
 static __always_inline bool rt_mutex_cmpxchg_release(struct rt_mutex *lock,
 						     struct task_struct *old,
 						     struct task_struct *new)
 {
-	return cmpxchg_release(&lock->owner, old, new) == old;
+	return try_cmpxchg_release(&lock->owner, &old, new);
 }
 
 /*