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@zytor.com>
Confirmed-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267469749-11878-4-git-send-email-luca@luca-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/atomic64.c b/lib/atomic64.c
index 8bee16ec7524..a21c12bc727c 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;