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s390/cmpxchg: Provide arch_try_cmpxchg128()

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Since gcc 14 flag output operands are supported also for s390.

Provide an arch_try_cmpxchg128() implementation so that all existing
try_cmpxchg128() variants provide slightly better code, if compiled
with gcc 14 or newer.

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 11:03:10 +01:00
parent de9e2eb891
commit c76b3bc285
1 changed files with 19 additions and 0 deletions
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19
arch/s390/include/asm/cmpxchg.h
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@ -251,4 +251,23 @@ static __always_inline u128 arch_cmpxchg128(volatile u128 *ptr, u128 old, u128 n
#define arch_cmpxchg128 arch_cmpxchg128
#define arch_cmpxchg128_local arch_cmpxchg128
#ifdef __HAVE_ASM_FLAG_OUTPUTS__
static __always_inline bool arch_try_cmpxchg128(volatile u128 *ptr, u128 *oldp, u128 new)
{
int cc;
asm volatile(
" cdsg %[old],%[new],%[ptr]\n"
: [old] "+d" (*oldp), [ptr] "+QS" (*ptr), "=@cc" (cc)
: [new] "d" (new)
: "memory");
return likely(cc == 0);
}
#define arch_try_cmpxchg128 arch_try_cmpxchg128
#define arch_try_cmpxchg128_local arch_try_cmpxchg128
#endif /* __HAVE_ASM_FLAG_OUTPUTS__ */
#endif /* __ASM_CMPXCHG_H */