[patch V5 13/72] rtmutex: Switch to try_cmpxchg()
From: Thomas Gleixner
Date: Sun Aug 15 2021 - 17:31:06 EST
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Allows the compiler to generate better code depending on the architecture.
Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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);
}
/*