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watchdog: using u64 in get_sample_period()

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In get_sample_period(), unsigned long is not enough:

  watchdog_thresh * 2 * (NSEC_PER_SEC / 5)

case1:
  watchdog_thresh is 10 by default, the sample value will be: 0xEE6B2800

case2:
 set watchdog_thresh is 20, the sample value will be: 0x1 DCD6 5000

In case2, we need use u64 to express the sample period.  Otherwise,
changing the threshold thru proc often can not be successful.

Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chuansheng Liu 2012-11-26 16:29:54 -08:00 committed by Linus Torvalds
parent 4eff96dd52
commit 8ffeb9b0e6
1 changed files with 2 additions and 2 deletions
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4
kernel/watchdog.c
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@ -116,7 +116,7 @@ static unsigned long get_timestamp(int this_cpu)
return cpu_clock(this_cpu) >> 30LL; /* 2^30 ~= 10^9 */
}
static unsigned long get_sample_period(void)
static u64 get_sample_period(void)
{
/*
* convert watchdog_thresh from seconds to ns
@ -125,7 +125,7 @@ static unsigned long get_sample_period(void)
* and hard thresholds) to increment before the
* hardlockup detector generates a warning
*/
return get_softlockup_thresh() * (NSEC_PER_SEC / 5);
return get_softlockup_thresh() * ((u64)NSEC_PER_SEC / 5);
}
/* Commands for resetting the watchdog */