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| author | Mark Rutland <mark.rutland@arm.com> | 2023-06-05 08:01:02 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-05 09:57:14 +0200 |
| commit | f739287ef57bc01155e556033462e9a6ff020c97 (patch) | |
| tree | e223f409ee3532f1f91a108313e819720bd111bb /arch/arc | |
| parent | d12157efc8e083c77d054675fcdd594f54cc7e2b (diff) | |
| download | lwn-f739287ef57bc01155e556033462e9a6ff020c97.tar.gz lwn-f739287ef57bc01155e556033462e9a6ff020c97.zip | |
locking/atomic: arc: 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/arc.
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/20230605070124.3741859-6-mark.rutland@arm.com
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/atomic-spinlock.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arc/include/asm/atomic-spinlock.h b/arch/arc/include/asm/atomic-spinlock.h index 2c830347bfb4..89d12a60f84c 100644 --- a/arch/arc/include/asm/atomic-spinlock.h +++ b/arch/arc/include/asm/atomic-spinlock.h @@ -81,6 +81,11 @@ static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \ ATOMIC_OPS(add, +=, add) ATOMIC_OPS(sub, -=, sub) +#define arch_atomic_fetch_add arch_atomic_fetch_add +#define arch_atomic_fetch_sub arch_atomic_fetch_sub +#define arch_atomic_add_return arch_atomic_add_return +#define arch_atomic_sub_return arch_atomic_sub_return + #undef ATOMIC_OPS #define ATOMIC_OPS(op, c_op, asm_op) \ ATOMIC_OP(op, c_op, asm_op) \ @@ -92,7 +97,11 @@ ATOMIC_OPS(or, |=, or) ATOMIC_OPS(xor, ^=, xor) #define arch_atomic_andnot arch_atomic_andnot + +#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 #undef ATOMIC_OPS #undef ATOMIC_FETCH_OP |