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doc: Clarify that nmi_watchdog param is for hardlockups 

The kernel NMI watchdog acts as both a hardlockup and softlockup detector.
However, the kernel parameter nmi_watchdog can only enable or disable the
hardlockup detector. Clarify that in the documentation.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Pranith Kumar 2015-10-10 15:40:42 -04:00 committed by Jonathan Corbet
parent 0ea1563bc1
commit 334bb79c18
1 changed files with 4 additions and 3 deletions
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7
Documentation/kernel-parameters.txt
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@ -2320,11 +2320,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels
Format: [panic,][nopanic,][num] Format: [panic,][nopanic,][num]
Valid num: 0 or 1 Valid num: 0 or 1
0 - turn nmi_watchdog off 0 - turn hardlockup detector in nmi_watchdog off
1 - turn nmi_watchdog on 1 - turn hardlockup detector in nmi_watchdog on
When panic is specified, panic when an NMI watchdog When panic is specified, panic when an NMI watchdog
timeout occurs (or 'nopanic' to override the opposite timeout occurs (or 'nopanic' to override the opposite
default). default). To disable both hard and soft lockup detectors,
please see 'nowatchdog'.
This is useful when you use a panic=... timeout and This is useful when you use a panic=... timeout and
need the box quickly up again. need the box quickly up again.