From: Mayank Rungta via B4 Relay <devnull+mrungta.google.com@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Guenter Roeck <linux@roeck-us.net>
Cc: Tzung-Bi Shih <tzungbi@kernel.org>,
Douglas Anderson <dianders@chromium.org>,
linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org,
Mayank Rungta <mrungta@google.com>
Subject: [PATCH 0/2] watchdog: pretimeout: Allow building dump governor as module
Date: Thu, 30 Jul 2026 15:00:20 -0700 [thread overview]
Message-ID: <20260730-export-cpu-backtrace-apis-v1-0-bace8e1cb817@google.com> (raw)
All other watchdog pretimeout governors (noop, panic) can be built as
loadable modules. However the "dump" pretimeout governor is restricted
to built-in code because it calls trigger_all_cpu_backtrace(), which
relies on arch_trigger_cpumask_backtrace(), an arch specific helper that
is not exported to loadable modules.
This 2-patch series allows building the dump governor as a module (=m):
1) Export cpumask_backtrace() in lib/nmi_backtrace.c.
2) Convert CONFIG_WATCHDOG_PRETIMEOUT_GOV_DUMP from bool to tristate.
Signed-off-by: Mayank Rungta <mrungta@google.com>
---
Mayank Rungta (2):
nmi: Export CPU backtrace APIs for loadable modules
watchdog: pretimeout: Convert dump pretimeout governor to tristate
drivers/watchdog/Kconfig | 4 ++--
include/linux/nmi.h | 10 ++++++----
lib/nmi_backtrace.c | 7 +++++++
3 files changed, 15 insertions(+), 6 deletions(-)
---
base-commit: 3fe08b9796f36ef437ab9328e7dd1e5ff2d66603
change-id: 20260728-export-cpu-backtrace-apis-136d3b819377
Best regards,
--
Mayank Rungta <mrungta@google.com>
next reply other threads:[~2026-07-30 22:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-30 22:00 Mayank Rungta via B4 Relay [this message]
2026-07-30 22:00 ` [PATCH 1/2] nmi: Export CPU backtrace APIs for loadable modules Mayank Rungta via B4 Relay
2026-07-31 1:54 ` Doug Anderson
2026-08-06 21:40 ` Guenter Roeck
2026-08-06 23:44 ` Andrew Morton
2026-08-07 3:50 ` Guenter Roeck
2026-07-30 22:00 ` [PATCH 2/2] watchdog: pretimeout: Convert dump pretimeout governor to tristate Mayank Rungta via B4 Relay
2026-07-31 1:55 ` Doug Anderson
2026-08-01 12:38 ` Tzung-Bi Shih
2026-08-06 21:41 ` Guenter Roeck
2026-08-06 23:44 ` Andrew Morton
2026-08-07 3:50 ` Guenter Roeck
2026-07-30 22:50 ` [PATCH 0/2] watchdog: pretimeout: Allow building dump governor as module Andrew Morton
2026-07-30 23:39 ` Mayank Rungta
2026-07-31 21:01 ` Andrew Morton
2026-07-31 21:19 ` Guenter Roeck
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