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From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 15 Aug 2021 23:27:55 +0200
Subject: [PATCH 13/72] locking/rtmutex: Switch to from cmpxchg_*() to
try_cmpxchg_*()
Allows the compiler to generate better code depending on the architecture.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211302.668958502@linutronix.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);
}
/*
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