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s390/preempt: Use arch_try_cmpxchg() instead of __atomic_cmpxchg()

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Use arch_try_cmpxchg() instead of __atomic_cmpxchg() in
preempt_count_set() to generate similar or better code,
depending in compiler features.

Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-11-06 11:03:14 +01:00
parent 5ba865ad57
commit 75a98ed6fa
1 changed files with 4 additions and 5 deletions
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9
arch/s390/include/asm/preempt.h
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@ -5,6 +5,7 @@
#include <asm/current.h>
#include <linux/thread_info.h>
#include <asm/atomic_ops.h>
#include <asm/cmpxchg.h>
#include <asm/march.h>
#ifdef MARCH_HAS_Z196_FEATURES
@ -22,12 +23,10 @@ static __always_inline void preempt_count_set(int pc)
{
int old, new;
old = READ_ONCE(get_lowcore()->preempt_count);
do {
old = READ_ONCE(get_lowcore()->preempt_count);
new = (old & PREEMPT_NEED_RESCHED) |
(pc & ~PREEMPT_NEED_RESCHED);
} while (__atomic_cmpxchg(&get_lowcore()->preempt_count,
old, new) != old);
new = (old & PREEMPT_NEED_RESCHED) | (pc & ~PREEMPT_NEED_RESCHED);
} while (!arch_try_cmpxchg(&get_lowcore()->preempt_count, &old, new));
}
static __always_inline void set_preempt_need_resched(void)