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atomics/riscv: Define atomic64_fetch_add_unless()

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As a step towards unifying the atomic/atomic64/atomic_long APIs, this
patch converts the arch/riscv implementation of atomic64_add_unless()
into an implementation of atomic64_fetch_add_unless().

A wrapper in <linux/atomic.h> will build atomic_add_unless() atop of
this, provided it is given a preprocessor definition.

No functional change is intended as a result of this patch.

Acked-by Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Albert Ou <albert@sifive.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/lkml/20180621121321.4761-14-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mark Rutland 2018-06-21 13:13:16 +01:00 committed by Ingo Molnar
parent 4f44b4b2b3
commit 2b523f170e
1 changed files with 2 additions and 6 deletions
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8
arch/riscv/include/asm/atomic.h
View file

@ -352,7 +352,7 @@ static __always_inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
#define atomic_fetch_add_unless atomic_fetch_add_unless
#ifndef CONFIG_GENERIC_ATOMIC64
static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u)
static __always_inline long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
{
long prev, rc;
@ -369,11 +369,7 @@ static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u)
: "memory");
return prev;
}
static __always_inline int atomic64_add_unless(atomic64_t *v, long a, long u)
{
return __atomic64_add_unless(v, a, u) != u;
}
#define atomic64_fetch_add_unless atomic64_fetch_add_unless
#endif
/*