kernel/linux.git/arch/arc/include/asm/atomic-spinlock.h, branch linux-7.0.y

locking/atomic: arc: add preprocessor symbols

2023-06-05T07:57:14+00:00

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 Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20230605070124.3741859-6-mark.rutland@arm.com

ARC: atomic: !LLSC: use int data type consistently

2021-08-24T21:25:46+00:00

Acked-by: Peter Zijlstra (Intel) Signed-off-by: Vineet Gupta

ARC: atomic: !LLSC: remove hack in atomic_set() for for UP

2021-08-24T21:25:46+00:00

!LLSC atomics use spinlock (SMP) or irq-disable (UP) to implement criticla regions. UP atomic_set() however was "cheating" by not doing any of that so and still being functional. Remove this anomaly (primarily as cleanup for future code improvements) given that this config is not worth hassle of special case code. Acked-by: Peter Zijlstra (Intel) Signed-off-by: Vineet Gupta

ARC: atomics: disintegrate header

2021-08-24T21:25:46+00:00

Non functional change, to ease future addition/removal Acked-by: Peter Zijlstra (Intel) Signed-off-by: Vineet Gupta