linux-kernel - [B.A.T.M.A.N.] [PATCH v4 9/9] net: batman-adv: use per_cpu

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Message-ID: <50A1A816.3070900@gmail.com>
Date:	Tue, 13 Nov 2012 02:53:26 +0100
From:	Shan Wei <shanwei88@...il.com>
To:	lindner_marek@...oo.de, siwu@....tu-chemnitz.de,
	ordex@...istici.org, b.a.t.m.a.n@...ts.open-mesh.org,
	David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>,
	Kernel-Maillist <linux-kernel@...r.kernel.org>,
	Shan Wei <shanwei88@...il.com>,
	Christoph Lameter <cl@...ux.com>
Subject: [B.A.T.M.A.N.] [PATCH v4 9/9] net: batman-adv: use per_cpu_add	helper

From: Shan Wei <davidshan@...cent.com>

this_cpu_add is an atomic operation.
and be more faster than per_cpu_ptr operation.

Signed-off-by: Shan Wei <davidshan@...cent.com>
Reviewed-by: Christoph Lameter <cl@...ux.com>
---
v4: no changes vs v3.
---
 net/batman-adv/main.h |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 897ba6a..3aef5b2 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -263,9 +263,7 @@ static inline bool batadv_has_timed_out(unsigned long timestamp,
 static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx,
 				      size_t count)
 {
-	int cpu = get_cpu();
-	per_cpu_ptr(bat_priv->bat_counters, cpu)[idx] += count;
-	put_cpu();
+	this_cpu_add(bat_priv->bat_counters[idx], count);
 }
 
 #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1)
-- 
1.7.1




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