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| author | Chuansheng Liu <chuansheng.liu@intel.com> | 2012-11-26 16:29:54 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-12-03 12:59:15 -0800 |
| commit | 872edb5fe78156f8a589e544bbe54eae07226356 (patch) | |
| tree | f15f1e2662aa68bd455e470b4e3b5efd0c07270b | |
| parent | 14179cd5869322c694831a86d77840379f413ffe (diff) | |
| download | lwn-872edb5fe78156f8a589e544bbe54eae07226356.tar.gz lwn-872edb5fe78156f8a589e544bbe54eae07226356.zip | |
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.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 3d0c56ad4792..53e44324b4d9 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 @@ -121,7 +121,7 @@ static unsigned long get_sample_period(void) * 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 */ |