linux-kernel - [PATCH v4 3/9] net: xfrm: use __this_cpu

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Date:	Tue, 13 Nov 2012 09:52:09 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	steffen.klassert@...unet.com, David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Kernel-Maillist <linux-kernel@...r.kernel.org>,
	cl@...ux-foundation.org, Shan Wei <shanwei88@...il.com>
Subject: [PATCH v4 3/9] net: xfrm: use __this_cpu_read per-cpu helper

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


Signed-off-by: Shan Wei <davidshan@...cent.com>
---
v4:
  derefrence pointer before reading to avoid compile warning.
---
 net/xfrm/xfrm_ipcomp.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index e5246fb..2906d52 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -276,18 +276,16 @@ static struct crypto_comp * __percpu *ipcomp_alloc_tfms(const char *alg_name)
 	struct crypto_comp * __percpu *tfms;
 	int cpu;
 
-	/* This can be any valid CPU ID so we don't need locking. */
-	cpu = raw_smp_processor_id();
 
 	list_for_each_entry(pos, &ipcomp_tfms_list, list) {
 		struct crypto_comp *tfm;
 
-		tfms = pos->tfms;
-		tfm = *per_cpu_ptr(tfms, cpu);
+		/* This can be any valid CPU ID so we don't need locking. */
+		tfm = __this_cpu_read(*pos->tfms);
 
 		if (!strcmp(crypto_comp_name(tfm), alg_name)) {
 			pos->users++;
-			return tfms;
+			return pos->tfms;
 		}
 	}
 
-- 
1.7.1


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