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atomics/generic: Define atomic64_fetch_add_unless()

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

Signed-off-by: Mark Rutland <[email protected]>
Reviewed-by: Will Deacon <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Mark Rutland 2018-06-21 13:13:11 +01:00 • committed by Ingo Molnar
commit 00b808ab79
2 changed files with 9 additions and 8 deletions
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14
lib/atomic64.c
View file

@ -178,18 +178,18 @@ long long atomic64_xchg(atomic64_t *v, long long new)
}
EXPORT_SYMBOL(atomic64_xchg);
bool atomic64_add_unless(atomic64_t *v, long long a, long long u)
long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
bool ret = false;
long long val;
raw_spin_lock_irqsave(lock, flags);
if (v->counter != u) {
val = v->counter;
if (val != u)
v->counter += a;
ret = true;
}
raw_spin_unlock_irqrestore(lock, flags);
return ret;
return val;
}
EXPORT_SYMBOL(atomic64_add_unless);
EXPORT_SYMBOL(atomic64_fetch_add_unless);