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Author SHA1 Message Date
Mark Rutland
f739287ef5 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
2023-06-05 09:57:14 +02:00
Vineet Gupta
ca766f04ad ARC: atomic: !LLSC: use int data type consistently
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
2021-08-24 14:25:46 -07:00
Vineet Gupta
b1040148b2 ARC: atomic: !LLSC: remove hack in atomic_set() for for UP
!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) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
2021-08-24 14:25:46 -07:00
Vineet Gupta
b0f839b4b9 ARC: atomics: disintegrate header
Non functional change, to ease future addition/removal

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
2021-08-24 14:25:46 -07:00