From 86a3b5f34fc1fb307abef4fde76bebd3edce0324 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 18 May 2016 12:42:21 +0200
Subject: locking/atomic, arch/rwsem: Employ atomic_long_fetch_add()
Now that we have fetch_add() we can stop using add_return() - val.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Low <jason.low2@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <waiman.long@hpe.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/rwsem-xadd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'kernel/locking')
diff --git a/kernel/locking/rwsem-xadd.c b/kernel/locking/rwsem-xadd.c
index 2031281bb940..447e08de1fab 100644
--- a/kernel/locking/rwsem-xadd.c
+++ b/kernel/locking/rwsem-xadd.c
@@ -153,7 +153,7 @@ __rwsem_mark_wake(struct rw_semaphore *sem,
if (wake_type != RWSEM_WAKE_READ_OWNED) {
adjustment = RWSEM_ACTIVE_READ_BIAS;
try_reader_grant:
- oldcount = atomic_long_add_return(adjustment, &sem->count) - adjustment;
+ oldcount = atomic_long_fetch_add(adjustment, &sem->count);
if (unlikely(oldcount < RWSEM_WAITING_BIAS)) {
/*
--
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