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Documentation: Better document the softlockup_panic sysctl

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Commit 9c44bc03fff4 ("softlockup: allow panic on lockup") added the
softlockup_panic sysctl, but didn't add information about it to the file
Documentation/admin-guide/sysctl/kernel.rst (which in that time certainly
wasn't rst and had other name!).

This patch just adds the respective documentation and references it from
the corresponding entry in Documentation/admin-guide/kernel-parameters.txt.

This patch was strongly based on Scott Wood's commit d22881dc13b6
("Documentation: Better document the hardlockup_panic sysctl").

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@canonical.com>
Link: https://lore.kernel.org/r/20200310183649.23163-1-gpiccoli@canonical.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Guilherme G. Piccoli 2020-03-10 15:36:49 -03:00 committed by Jonathan Corbet
parent 23f03fe220
commit 0a07bef6e5
2 changed files with 18 additions and 4 deletions
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8
Documentation/admin-guide/kernel-parameters.txt
View File

@ -4516,10 +4516,10 @@
Format: <integer>
A nonzero value instructs the soft-lockup detector
to panic the machine when a soft-lockup occurs. This
is also controlled by CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC
which is the respective build-time switch to that
functionality.
to panic the machine when a soft-lockup occurs. It is
also controlled by the kernel.softlockup_panic sysctl
and CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC, which is the
respective build-time switch to that functionality.
softlockup_all_cpu_backtrace=
[KNL] Should the soft-lockup detector generate

14
Documentation/admin-guide/sysctl/kernel.rst
View File

@ -1036,6 +1036,20 @@ NMI.
= ============================================
softlockup_panic
=================
This parameter can be used to control whether the kernel panics
when a soft lockup is detected.
= ============================================
0 Don't panic on soft lockup.
1 Panic on soft lockup.
= ============================================
This can also be set using the softlockup_panic kernel parameter.
soft_watchdog
=============