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authorChuansheng Liu <chuansheng.liu@intel.com>2012-11-26 16:29:54 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-12-03 11:38:15 -0800
commit996d9a5f19e57371ab68e55ad09477cde2771918 (patch)
treee0d941cb9e14ce839c1afe1a31c27137d4c05ffb
parent8f90c1386466ff66fc9f23ce0dfc7311c5e4a22d (diff)
downloadlinux-linaro-stable-996d9a5f19e57371ab68e55ad09477cde2771918.tar.gz
watchdog: using u64 in get_sample_period()
commit 8ffeb9b0e6369135bf03a073514f571ef10606b9 upstream. 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> Signed-off-by: Shuah Khan <shuah.khan@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/watchdog.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 4b1dfba70f7c..775fa0f5e078 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -113,7 +113,7 @@ 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
@@ -122,7 +122,7 @@ 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 */