[PATCHv4 10/11] drop_monitor: Use *_dec_not_zero instead of *_add_unless

atomic_dec_not_zero is defined for each architecture through
<linux/atomic.h> to provide the functionality of
atomic_add_unless(x, -1, 0).

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: <redacted>
---
 net/core/drop_monitor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index 7f36b38..ef4a05d 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c

@@ -137,7 +137,7 @@ static void trace_drop_common(struct sk_buff *skb, void *location)
 	struct per_cpu_dm_data *data = &__get_cpu_var(dm_cpu_data);
 
 
-	if (!atomic_add_unless(&data->dm_hit_count, -1, 0)) {
+	if (!atomic_dec_not_zero(&data->dm_hit_count)) {
 		/*
 		 * we're already at zero, discard this hit
 		 */

-- 
1.7.5.4