linux-kernel - [PATCH 04/16] rcu: Remove redundant check for an online CPU

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Message-Id: <1406092194-13004-5-git-send-email-bobby.prani@gmail.com>
Date:	Wed, 23 Jul 2014 01:09:41 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org (open list:READ-COPY UPDATE...)
Subject: [PATCH 04/16] rcu: Remove redundant check for an online CPU

rcu_prcess_callbacks() is the softirq handler for RCU which is raised from
invoke_rcu_core() which is called from __call_rcu_core().

Each of these three functions checks if the cpu is online. We can remove the
redundant ones. This commit removes one of these redundant check.

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 kernel/rcu/tree.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 72e0b1f..044946e 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2563,8 +2563,6 @@ static void rcu_process_callbacks(struct softirq_action *unused)
 {
 	struct rcu_state *rsp;
 
-	if (cpu_is_offline(smp_processor_id()))
-		return;
 	trace_rcu_utilization(TPS("Start RCU core"));
 	for_each_rcu_flavor(rsp)
 		__rcu_process_callbacks(rsp);
-- 
2.0.0.rc2

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