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| author | Peter Zijlstra <peterz@infradead.org> | 2023-05-31 16:08:36 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-05 10:36:35 +0300 |
| commit | b23e139d0b66c0216e7e9361a5021290395f504c (patch) | |
| tree | 0f4d5c909eab20ea594dda67675d6233923efcf3 /arch/s390 | |
| parent | 224d80c584d3016cb8d83d1c33914fdd3508aa8c (diff) | |
| download | linux-b23e139d0b66c0216e7e9361a5021290395f504c.tar.xz | |
arch: Introduce arch_{,try_}_cmpxchg128{,_local}()
For all architectures that currently support cmpxchg_double()
implement the cmpxchg128() family of functions that is basically the
same but with a saner interface.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20230531132323.452120708@infradead.org
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/cmpxchg.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h index 06e0e42f4eec..7517376fdccc 100644 --- a/arch/s390/include/asm/cmpxchg.h +++ b/arch/s390/include/asm/cmpxchg.h @@ -224,4 +224,18 @@ static __always_inline int __cmpxchg_double(unsigned long p1, unsigned long p2, (unsigned long)(n1), (unsigned long)(n2)); \ }) +#define system_has_cmpxchg128() 1 + +static __always_inline u128 arch_cmpxchg128(volatile u128 *ptr, u128 old, u128 new) +{ + asm volatile( + " cdsg %[old],%[new],%[ptr]\n" + : [old] "+d" (old), [ptr] "+QS" (*ptr) + : [new] "d" (new) + : "memory", "cc"); + return old; +} + +#define arch_cmpxchg128 arch_cmpxchg128 + #endif /* __ASM_CMPXCHG_H */ |