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locking/atomic: arm: add preprocessor symbols

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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
This commit is contained in:
Mark Rutland 2023-06-05 08:01:03 +01:00 committed by Peter Zijlstra
parent f739287ef5
commit d6cd366480
1 changed files with 10 additions and 2 deletions
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12
arch/arm/include/asm/atomic.h
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@ -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) \