From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753561Ab3BCQBh (ORCPT ); Sun, 3 Feb 2013 11:01:37 -0500 Received: from mail-pa0-f54.google.com ([209.85.220.54]:55507 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752251Ab3BCQBf (ORCPT ); Sun, 3 Feb 2013 11:01:35 -0500 From: anish kumar To: akpm@linux-foundation.org, dzickus@redhat.com, tglx@linutronix.de, mingo@kernel.org, chuansheng.liu@intel.com, linux-kernel@vger.kernel.org Cc: anish kumar Subject: [PATCH] [Watchdog][Trivial] Added comments to explain watchdog_disabled variable Date: Sun, 3 Feb 2013 21:31:15 +0530 Message-Id: <1359907275-15410-1-git-send-email-anish198519851985@gmail.com> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: anish kumar This watchdog_disabled flag is bit of cryptic.Howerver it's usefullnes is multifold. Uses are: 1. Check if smpboot_register_percpu_thread function passed. 2. Makes sure that user enables and disables the watchdog in sequence i.e. enable watchdog->disable watchdog->enable watchdog Unlike enable watchdog->enable watchdog which is wrong. Signed-off-by: anish kumar --- kernel/watchdog.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 75a2ab3..87a19aa 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -518,6 +518,11 @@ int proc_dowatchdog(struct ctl_table *table, int write, return ret; set_sample_period(); + /* + * We shouldn't enable watchdog threads if it is + * disabled.This is done by watchdog_disabled + * variable check in watchdog_*_all_cpus function. + */ if (watchdog_enabled && watchdog_thresh) watchdog_enable_all_cpus(); else -- 1.7.1