From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932216AbbAGRyD (ORCPT ); Wed, 7 Jan 2015 12:54:03 -0500 Received: from e33.co.us.ibm.com ([32.97.110.151]:52675 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932141AbbAGRw7 (ORCPT ); Wed, 7 Jan 2015 12:52:59 -0500 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 10/10] rcu: Initialize tiny RCU stall-warning timeouts at boot Date: Wed, 7 Jan 2015 09:52:48 -0800 Message-Id: <1420653168-6434-10-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1420653168-6434-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20150107175225.GA4237@linux.vnet.ibm.com> <1420653168-6434-1-git-send-email-paulmck@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15010717-0009-0000-0000-000007C65C66 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" The current tiny RCU stall-warning code assumes that the jiffies counter starts at zero, however, it is sometimes initialized to other values, for example, -30,000. This commit therefore changes rcu_init() to invoke reset_cpu_stall_ticks() for both flavors of RCU to initialize the stall-warning times properly at boot. Signed-off-by: Paul E. McKenney --- kernel/rcu/tiny.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index 0db5649f8817..fc0f2c07af3a 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -383,6 +383,8 @@ EXPORT_SYMBOL_GPL(call_rcu_bh); void __init rcu_init(void) { open_softirq(RCU_SOFTIRQ, rcu_process_callbacks); + RCU_TRACE(reset_cpu_stall_ticks(&rcu_sched_ctrlblk)); + RCU_TRACE(reset_cpu_stall_ticks(&rcu_bh_ctrlblk)); rcu_early_boot_tests(); } -- 1.8.1.5