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docs: document panic fully in sysctl/kernel.rst 

The description of panic doesn’t cover all the supported scenarios;
this patch fixes that, describing the three possibilities (no reboot,
immediate reboot, reboot after a delay).

Based on the implementation in kernel/panic.c.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Stephen Kitt 2020-02-18 13:59:21 +01:00 committed by Jonathan Corbet
parent a1ad4f1505
commit 404347e68a
1 changed files with 9 additions and 3 deletions
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12
Documentation/admin-guide/sysctl/kernel.rst
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@ -559,9 +559,15 @@ The default is 65534.
panic
=====
The value in this file represents the number of seconds the kernel
waits before rebooting on a panic. When you use the software watchdog,
the recommended setting is 60.
The value in this file determines the behaviour of the kernel on a
panic:
* if zero, the kernel will loop forever;
* if negative, the kernel will reboot immediately;
* if positive, the kernel will reboot after the corresponding number
of seconds.
When you use the software watchdog, the recommended setting is 60.
panic_on_io_nmi