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Documentation: document hung_task_panic kernel parameter

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This parameter has been around since commit e162b39a36 ("softlockup:
decouple hung tasks check from softlockup detection") in 2009 but was
never documented.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Omar Sandoval 2018-05-21 11:18:17 -07:00 committed by Jonathan Corbet
parent f462951e87
commit a49d9c0ae4
1 changed files with 10 additions and 1 deletions
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11
Documentation/admin-guide/kernel-parameters.txt
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@ -1341,12 +1341,21 @@
x86-64 are 2M (when the CPU supports "pse") and 1G
(when the CPU supports the "pdpe1gb" cpuinfo flag).
hung_task_panic=
[KNL] Should the hung task detector generate panics.
Format: <integer>
A nonzero value instructs the kernel to panic when a
hung task is detected. The default value is controlled
by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
option. The value selected by this boot parameter can
be changed later by the kernel.hung_task_panic sysctl.
hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC)
terminal devices. Valid values: 0..8
hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
If specified, z/VM IUCV HVC accepts connections
from listed z/VM user IDs only.
keep_bootcon [KNL]
Do not unregister boot console at start. This is only
useful for debugging when something happens in the window