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locking/atomic: make ARCH_ATOMIC a Kconfig symbol

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Subsequent patches will move architectures over to the ARCH_ATOMIC API,
after preparing the asm-generic atomic implementations to function with
or without ARCH_ATOMIC.

As some architectures use the asm-generic implementations exclusively
(and don't have a local atomic.h), and to avoid the risk that
ARCH_ATOMIC isn't defined in some cases we expect, let's make the
ARCH_ATOMIC macro a Kconfig symbol instead, so that we can guarantee it
is consistently available where needed.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-2-mark.rutland@arm.com
This commit is contained in:
Mark Rutland 2021-05-25 15:02:00 +01:00 • committed by Peter Zijlstra
parent a82adc7650
commit 9be85de977
9 changed files with 8 additions and 7 deletions
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2
include/linux/atomic.h
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@ -77,7 +77,7 @@
__ret; \
})
#ifdef ARCH_ATOMIC
#ifdef CONFIG_ARCH_ATOMIC
#include <linux/atomic-arch-fallback.h>
#include <asm-generic/atomic-instrumented.h>
#else