diff options
| author |   Mandeep Singh Baines <msb@google.com> | 2009-01-12 21:15:17 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-01-14 11:48:07 +0100 |
| commit | baf48f6577e581a9adb8fe849dc80e24b21d171d (patch) | |
| tree | 279e54b7374a9c52025ded4f9bb718e5382b0340 /include/linux/sched.h | |
| parent | rcu: add __cpuinit to rcu_init_percpu_data() (diff) | |
| download | linux-dev-baf48f6577e581a9adb8fe849dc80e24b21d171d.tar.xz linux-dev-baf48f6577e581a9adb8fe849dc80e24b21d171d.zip | |
softlock: fix false panic which can occur if softlockup_thresh is reduced
At run-time, if softlockup_thresh is changed to a much lower value,
touch_timestamp is likely to be much older than the new softlock_thresh.
This will cause a false softlockup to be detected. If softlockup_panic
is enabled, the system will panic.
The fix is to touch all watchdogs before changing softlockup_thresh.
Signed-off-by: Mandeep Singh Baines <msb@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 4cae9b81a1f8..54cbabf3b871 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -293,6 +293,9 @@ extern void sched_show_task(struct task_struct *p); extern void softlockup_tick(void); extern void touch_softlockup_watchdog(void); extern void touch_all_softlockup_watchdogs(void); +extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, + struct file *filp, void __user *buffer, + size_t *lenp, loff_t *ppos); extern unsigned int softlockup_panic; extern unsigned long sysctl_hung_task_check_count; extern unsigned long sysctl_hung_task_timeout_secs; |