netdev - [PATCHv4 10/11] drop_monitor: Use *_dec_not_zero instead of *_add

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Date:	Wed, 27 Jul 2011 11:47:49 +0200
From:	Sven Eckelmann <sven@...fation.org>
To:	linux-arch@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Sven Eckelmann <sven@...fation.org>,
	Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org
Subject: [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@...fation.org>
Cc: Neil Horman <nhorman@...driver.com>
Cc: netdev@...r.kernel.org
---
 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

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