watchdog: using u64 in get_sample_period()
authorChuansheng Liu <chuansheng.liu@intel.com>
Tue, 27 Nov 2012 00:29:54 +0000 (16:29 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 3 Dec 2012 19:47:17 +0000 (11:47 -0800)
commit53b360c604575070c83d2da83636af4e5c5de35a
treef32a2a1681f43c565b4c36009d8e80ee947c3cd4
parent368c8c73d4648843bece41f7c083f11fa4d1aa36
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>
kernel/watchdog.c