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kernel/watchdog.c: allow hardlockup to panic by default

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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.

[[email protected]: fix strncmp length]
Signed-off-by: Don Zickus <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Reviewed-by: WANG Cong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Don Zickus 2011-03-22 16:34:16 -07:00 • committed by Linus Torvalds
commit fef2c9bc1b
3 changed files with 24 additions and 3 deletions
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5
Documentation/kernel-parameters.txt
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@ -1597,11 +1597,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: [state][,regs][,debounce][,die]
nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels
Format: [panic,][num]
Format: [panic,][nopanic,][num]
Valid num: 0
0 - turn nmi_watchdog off
When panic is specified, panic when an NMI watchdog
timeout occurs.
timeout occurs (or 'nopanic' to override the opposite
default).
This is useful when you use a panic=... timeout and
need the box quickly up again.