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kernel/watchdog.c:touch_softlockup_watchdog(): use raw_cpu_write()

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Fix:

  BUG: using __this_cpu_write() in preemptible [00000000] code: systemd-udevd/497
  caller is __this_cpu_preempt_check+0x13/0x20
  CPU: 3 PID: 497 Comm: systemd-udevd Tainted: G        W     3.15.0-rc1 #9
  Hardware name: Hewlett-Packard HP EliteBook 8470p/179B, BIOS 68ICF Ver. F.02 04/27/2012
  Call Trace:
    check_preemption_disabled+0xe1/0xf0
    __this_cpu_preempt_check+0x13/0x20
    touch_nmi_watchdog+0x28/0x40

Reported-by: Luis Henriques <[email protected]>
Tested-by: Luis Henriques <[email protected]>
Cc: Eric Piel <[email protected]>
Cc: Robert Moore <[email protected]>
Cc: Lv Zheng <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton 2014-04-18 15:07:12 -07:00 • committed by Linus Torvalds
commit 7861144b8c
1 changed files with 5 additions and 1 deletions
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6
kernel/watchdog.c
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@ -138,7 +138,11 @@ static void __touch_watchdog(void)
void touch_softlockup_watchdog(void)
{
__this_cpu_write(watchdog_touch_ts, 0);
/*
* Preemption can be enabled. It doesn't matter which CPU's timestamp
* gets zeroed here, so use the raw_ operation.
*/
raw_cpu_write(watchdog_touch_ts, 0);
}
EXPORT_SYMBOL(touch_softlockup_watchdog);