watchdog: pretimeout: Add "dump" pretimeout governor

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Add a new "dump" pretimeout governor that triggers a backtrace of all
CPUs (via trigger_all_cpu_backtrace()) to the kernel log buffer.  This
provides diagnostic information right before the hardware watchdog
fires.

In addition, update the WATCHDOG_PRETIMEOUT_GOV_SEL Kconfig logic to
fall back to the "panic" governor only when both "noop" and "dump"
governors are disabled.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20260707102105.3600275-1-tzungbi@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

...

This commit is contained in:

Tzung-Bi Shih 2026-07-07 10:21:05 +00:00 • committed by Guenter Roeck

parent dac35bdc5c

commit 8bb763d4c3

4 changed files with 67 additions and 2 deletions

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19

drivers/watchdog/Kconfig

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1

drivers/watchdog/Makefile

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45

drivers/watchdog/pretimeout_dump.c

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4

drivers/watchdog/watchdog_pretimeout.h

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