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| author | Don Zickus <dzickus@redhat.com> | 2011-03-22 16:34:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:12 -0700 |
| commit | fef2c9bc1b54c0261324a96e948c0b849796e896 (patch) | |
| tree | a4dd2733621d9fe1f8ec65d9ef30867ed09b640f /kernel/watchdog.c | |
| parent | b1b5f65e53af770ede22c113e249de2f6fa53706 (diff) | |
| download | linux-stable-fef2c9bc1b54c0261324a96e948c0b849796e896.tar.gz linux-stable-fef2c9bc1b54c0261324a96e948c0b849796e896.tar.bz2 linux-stable-fef2c9bc1b54c0261324a96e948c0b849796e896.zip | |
kernel/watchdog.c: allow hardlockup to panic by default
When a cpu is considered stuck, instead of limping along and just printing
a warning, it is sometimes preferred to just panic, let kdump capture the
vmcore and reboot. This gets the machine back into a stable state quickly
while saving the info that got it into a stuck state to begin with.
Add a Kconfig option to allow users to set the hardlockup to panic
by default. Also add in a 'nmi_watchdog=nopanic' to override this.
[akpm@linux-foundation.org: fix strncmp length]
Signed-off-by: Don Zickus <dzickus@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 18bb15776c57..054a67cca9da 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -48,12 +48,15 @@ static DEFINE_PER_CPU(struct perf_event *, watchdog_ev); * Should we panic when a soft-lockup or hard-lockup occurs: */ #ifdef CONFIG_HARDLOCKUP_DETECTOR -static int hardlockup_panic; +static int hardlockup_panic = + CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE; static int __init hardlockup_panic_setup(char *str) { if (!strncmp(str, "panic", 5)) hardlockup_panic = 1; + else if (!strncmp(str, "nopanic", 7)) + hardlockup_panic = 0; else if (!strncmp(str, "0", 1)) watchdog_enabled = 0; return 1; |