linux-kernel - [PATCH v2 6/9] rcu: use __this_cpu_read helper instead of per_cpu_ptr(p, raw_smp_processor

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Message-ID: <5093EE6B.3070906@gmail.com>
Date:	Sat, 03 Nov 2012 00:01:47 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	dipankar@...ibm.com, paulmck@...ux.vnet.ibm.com,
	Kernel-Maillist <linux-kernel@...r.kernel.org>,
	cl@...ux-foundation.org, Shan Wei <shanwei88@...il.com>
Subject: [PATCH v2 6/9] rcu: use __this_cpu_read helper instead of per_cpu_ptr(p,
 raw_smp_processor_id())

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

Signed-off-by: Shan Wei <davidshan@...cent.com>
---
 kernel/rcutree.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 74df86b..441b945 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1960,7 +1960,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
 	struct rcu_node *rnp_old = NULL;
 
 	/* Funnel through hierarchy to reduce memory contention. */
-	rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
+	rnp = __this_cpu_read(rsp->rda->mynode);
 	for (; rnp != NULL; rnp = rnp->parent) {
 		ret = (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) ||
 		      !raw_spin_trylock(&rnp->fqslock);
-- 
1.7.1


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