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| author | Mark Rutland <mark.rutland@arm.com> | 2023-06-05 10:01:01 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-05 10:57:14 +0300 |
| commit | d12157efc8e083c77d054675fcdd594f54cc7e2b (patch) | |
| tree | 9be23f46b4b8db9d3e36a8b551d8961d8d41822d /arch/arm/include | |
| parent | a7bafa7969da1c0e9c342c792d8224078d1c491c (diff) | |
| download | linux-d12157efc8e083c77d054675fcdd594f54cc7e2b.tar.xz | |
locking/atomic: make atomic*_{cmp,}xchg optional
Most architectures define the atomic/atomic64 xchg and cmpxchg
operations in terms of arch_xchg and arch_cmpxchg respectfully.
Add fallbacks for these cases and remove the trivial cases from arch
code. On some architectures the existing definitions are kept as these
are used to build other arch_atomic*() operations.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605070124.3741859-5-mark.rutland@arm.com
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/atomic.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h index db8512d9a918..9458d47ff209 100644 --- a/arch/arm/include/asm/atomic.h +++ b/arch/arm/include/asm/atomic.h @@ -210,6 +210,7 @@ static inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new) return ret; } +#define arch_atomic_cmpxchg arch_atomic_cmpxchg #define arch_atomic_fetch_andnot arch_atomic_fetch_andnot @@ -240,8 +241,6 @@ ATOMIC_OPS(xor, ^=, eor) #undef ATOMIC_OP_RETURN #undef ATOMIC_OP -#define arch_atomic_xchg(v, new) (arch_xchg(&((v)->counter), new)) - #ifndef CONFIG_GENERIC_ATOMIC64 typedef struct { s64 counter; |