linux-kernel - [PATCH v3 3/9] net: xfrm: use __this_cpu

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Date:	Fri, 09 Nov 2012 10:20:59 +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 v3 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>
---
v3 fix compile warning:
net/xfrm/xfrm_ipcomp.c: In function 'ipcomp_alloc_tfms':
net/xfrm/xfrm_ipcomp.c:285: warning: assignment from incompatible pointer type

---
 net/xfrm/xfrm_ipcomp.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index e5246fb..898c899 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -276,18 +276,15 @@ 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);
+		tfm = (struct crypto_comp *) __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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