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| author | Mark Rutland <mark.rutland@arm.com> | 2023-06-05 10:01:03 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-05 10:57:15 +0300 |
| commit | d6cd3664806fbe8313b8e04b042d40e8135ca459 (patch) | |
| tree | 3b6c3bb4831938d661179ecdb96dd33e3449acc2 /arch/arm/include | |
| parent | f739287ef57bc01155e556033462e9a6ff020c97 (diff) | |
| download | linux-d6cd3664806fbe8313b8e04b042d40e8135ca459.tar.xz | |
locking/atomic: arm: add preprocessor symbols
Some atomics can be implemented in several different ways, e.g.
FULL/ACQUIRE/RELEASE ordered atomics can be implemented in terms of
RELAXED atomics, and ACQUIRE/RELEASE/RELAXED can be implemented in terms
of FULL ordered atomics. Other atomics are optional, and don't exist in
some configurations (e.g. not all architectures implement the 128-bit
cmpxchg ops).
Subsequent patches will require that architectures define a preprocessor
symbol for any atomic (or ordering variant) which is optional. This will
make the fallback ifdeffery more robust, and simplify future changes.
Add the required definitions to arch/arm.
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/20230605070124.3741859-7-mark.rutland@arm.com
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/atomic.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h index 9458d47ff209..f0e3b01afa74 100644 --- a/arch/arm/include/asm/atomic.h +++ b/arch/arm/include/asm/atomic.h @@ -197,6 +197,16 @@ static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \ return val; \ } +#define arch_atomic_add_return arch_atomic_add_return +#define arch_atomic_sub_return arch_atomic_sub_return +#define arch_atomic_fetch_add arch_atomic_fetch_add +#define arch_atomic_fetch_sub arch_atomic_fetch_sub + +#define arch_atomic_fetch_and arch_atomic_fetch_and +#define arch_atomic_fetch_andnot arch_atomic_fetch_andnot +#define arch_atomic_fetch_or arch_atomic_fetch_or +#define arch_atomic_fetch_xor arch_atomic_fetch_xor + static inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new) { int ret; @@ -212,8 +222,6 @@ static inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new) } #define arch_atomic_cmpxchg arch_atomic_cmpxchg -#define arch_atomic_fetch_andnot arch_atomic_fetch_andnot - #endif /* __LINUX_ARM_ARCH__ */ #define ATOMIC_OPS(op, c_op, asm_op) \ |