linux-kernel - [PATCH 3/5] lib: fix atomic64_add

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Date:	Mon,  1 Mar 2010 19:55:47 +0100
From:	Luca Barbieri <luca@...a-barbieri.com>
To:	hpa@...or.com
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, paulus@...ba.org,
	linux-kernel@...r.kernel.org,
	Luca Barbieri <luca@...a-barbieri.com>
Subject: [PATCH 3/5] lib: fix atomic64_add_unless return value convention

atomic64_add_unless must return 1 if it perfomed the add and 0 otherwise.
The generic implementation did the opposite thing.

Reported-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Luca Barbieri <luca@...a-barbieri.com>
---
 lib/atomic64.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/atomic64.c b/lib/atomic64.c
index 8bee16e..a21c12b 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -162,12 +162,12 @@ int atomic64_add_unless(atomic64_t *v, long long a, long long u)
 {
 	unsigned long flags;
 	spinlock_t *lock = lock_addr(v);
-	int ret = 1;
+	int ret = 0;
 
 	spin_lock_irqsave(lock, flags);
 	if (v->counter != u) {
 		v->counter += a;
-		ret = 0;
+		ret = 1;
 	}
 	spin_unlock_irqrestore(lock, flags);
 	return ret;
-- 
1.6.6.1.476.g01ddb

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