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| author | Uros Bizjak <ubizjak@gmail.com> | 2023-04-05 16:17:08 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-04-29 09:09:16 +0200 |
| commit | d994f2c8e2410ebcb928df67baa6f04e29bc9d3e (patch) | |
| tree | d410609c74e79e17a758aec1be8e043603be8e61 /arch/powerpc | |
| parent | 8fc4fddaf9a184eea7da21290236a1764e608a01 (diff) | |
| download | linux-d994f2c8e2410ebcb928df67baa6f04e29bc9d3e.tar.gz linux-d994f2c8e2410ebcb928df67baa6f04e29bc9d3e.tar.bz2 linux-d994f2c8e2410ebcb928df67baa6f04e29bc9d3e.zip | |
locking/arch: Wire up local_try_cmpxchg()
Implement target specific support for local_try_cmpxchg()
and local_cmpxchg() using typed C wrappers that call their
_local counterpart and provide additional checking of
their input arguments.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230405141710.3551-4-ubizjak@gmail.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/local.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h index bc4bd19b7fc2..45492fb5bf22 100644 --- a/arch/powerpc/include/asm/local.h +++ b/arch/powerpc/include/asm/local.h @@ -90,6 +90,17 @@ static __inline__ long local_cmpxchg(local_t *l, long o, long n) return t; } +static __inline__ bool local_try_cmpxchg(local_t *l, long *po, long n) +{ + long o = *po, r; + + r = local_cmpxchg(l, o, n); + if (unlikely(r != o)) + *po = r; + + return likely(r == o); +} + static __inline__ long local_xchg(local_t *l, long n) { long t; |