From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757326AbaGWFKt (ORCPT ); Wed, 23 Jul 2014 01:10:49 -0400 Received: from mail-yk0-f178.google.com ([209.85.160.178]:44133 "EHLO mail-yk0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756992AbaGWFKr (ORCPT ); Wed, 23 Jul 2014 01:10:47 -0400 From: Pranith Kumar To: "Paul E. McKenney" , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , linux-kernel@vger.kernel.org (open list:READ-COPY UPDATE...) Subject: [PATCH 04/16] rcu: Remove redundant check for an online CPU Date: Wed, 23 Jul 2014 01:09:41 -0400 Message-Id: <1406092194-13004-5-git-send-email-bobby.prani@gmail.com> X-Mailer: git-send-email 2.0.0.rc2 In-Reply-To: <1406092194-13004-1-git-send-email-bobby.prani@gmail.com> References: <1406092194-13004-1-git-send-email-bobby.prani@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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