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authorMark Rutland <mark.rutland@arm.com>2018-06-21 14:13:11 +0200
committerIngo Molnar <mingo@kernel.org>2018-06-21 14:25:21 +0200
commit00b808ab79ead372daf1a0682d1ef271599c0b55 (patch)
treeb6b2384e169533b9f40e213f7cb49cab190c23f5 /lib/atomic64.c
parentatomics: Prepare for atomic64_fetch_add_unless() (diff)
downloadlinux-00b808ab79ead372daf1a0682d1ef271599c0b55.tar.xz
linux-00b808ab79ead372daf1a0682d1ef271599c0b55.zip
atomics/generic: Define atomic64_fetch_add_unless()
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 <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/lkml/20180621121321.4761-9-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/atomic64.c')
-rw-r--r--lib/atomic64.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/lib/atomic64.c b/lib/atomic64.c
index 4230f4b8906c..1d91e31eceec 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -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);