linux-kernel - [raw v1 2/4] [NET] Use raw

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Message-Id: <0000014194309205-d0af4d2d-a046-4189-b4f0-ffea37374988-000000@email.amazonses.com>
Date:	Mon, 7 Oct 2013 18:31:58 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>
Subject: [raw v1 2/4] [NET] Use raw_cpu ops for SNMP stats

SNMP stats are not protected by preemption but by bh handling.
Since protection is provided outside of preemption raw_cpu_ops
need to be used to avoid false positives.

Cc: Eric Dumazet <edumazet@...gle.com>
CC: netdev@...r.kernel.org
Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/include/net/snmp.h
===================================================================
--- linux.orig/include/net/snmp.h	2013-10-07 09:16:07.595206864 -0500
+++ linux/include/net/snmp.h	2013-10-07 09:16:07.591206909 -0500
@@ -126,7 +126,7 @@ struct linux_xfrm_mib {
 	extern __typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
 
 #define SNMP_INC_STATS_BH(mib, field)	\
-			__this_cpu_inc(mib[0]->mibs[field])
+			raw_cpu_inc(mib[0]->mibs[field])
 
 #define SNMP_INC_STATS_USER(mib, field)	\
 			this_cpu_inc(mib[0]->mibs[field])
@@ -141,7 +141,7 @@ struct linux_xfrm_mib {
 			this_cpu_dec(mib[0]->mibs[field])
 
 #define SNMP_ADD_STATS_BH(mib, field, addend)	\
-			__this_cpu_add(mib[0]->mibs[field], addend)
+			raw_cpu_add(mib[0]->mibs[field], addend)
 
 #define SNMP_ADD_STATS_USER(mib, field, addend)	\
 			this_cpu_add(mib[0]->mibs[field], addend)

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