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watchdog: Add comments to explain the watchdog_disabled variable 

The watchdog_disabled flag is a bit cryptic. However it's
usefulness 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@gmail.com>
[small text cleanups]
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: chuansheng.liu@intel.com
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1363113848-18344-1-git-send-email-dzickus@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
anish kumar 2013-03-12 14:44:08 -04:00 committed by Ingo Molnar
parent 877c685607
commit b66a2356d7
1 changed files with 5 additions and 0 deletions
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5
kernel/watchdog.c
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@ -517,6 +517,11 @@ int proc_dowatchdog(struct ctl_table *table, int write,
return ret;
set_sample_period();
/*
* Watchdog threads shouldn't be enabled if they are
* disabled. The 'watchdog_disabled' variable check in
* watchdog_*_all_cpus() function takes care of this.
*/
if (watchdog_enabled && watchdog_thresh)
watchdog_enable_all_cpus();
else