[PATCH] [Watchdog][Trivial] Added comments to explain watchdog_disabled variable

[anish kumar]

From: anish kumar <anish198519851985@xxxxxxxxx>

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 <anish198519851985@xxxxxxxxx>
---
 kernel/watchdog.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 6ef638b..dfd843a 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -519,6 +519,11 @@ int proc_dowatchdog(struct ctl_table *table, int write,
 		return ret;
 
 	set_sample_period();
+	/*
+	 * We shouldn't enable watchdog threads if it is not
+	 * 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

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