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Date: Fri, 31 Jul 2026 14:01:42 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Mayank Rungta <mrungta@google.com>
Cc: Mayank Rungta via B4 Relay <devnull+mrungta.google.com@kernel.org>, Wim
 Van Sebroeck <wim@linux-watchdog.org>, Guenter Roeck <linux@roeck-us.net>,
 Tzung-Bi Shih <tzungbi@kernel.org>, Douglas Anderson
 <dianders@chromium.org>, linux-kernel@vger.kernel.org,
 linux-watchdog@vger.kernel.org
Subject: Re: [PATCH 0/2] watchdog: pretimeout: Allow building dump governor
 as module
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References: <20260730-export-cpu-backtrace-apis-v1-0-bace8e1cb817@google.com>
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On Thu, 30 Jul 2026 16:39:14 -0700 Mayank Rungta <mrungta@google.com> wrote:

> On Thu, Jul 30, 2026 at 3:50 PM Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> > On Thu, 30 Jul 2026 15:00:20 -0700 Mayank Rungta via B4 Relay <devnull+mrungta.google.com@kernel.org> wrote:
> >
> > > 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.
> >
> > LGTM.  Can you please redo against current mainline?  The Kconfig has
> > changed.
> >
> 
> Thanks for the LGTM!
> 
> Regarding rebasing onto mainline (origin/master): The "dump"
> pretimeout governor was added recently by Tzung-Bi Shih ("watchdog:
> pretimeout: Add "dump" pretimeout governor") and is currently in
> linux-next, so it hasn't landed in mainline tree yet.
> 
> Because of this dependency, I based this series on linux-next so that
> patch 2/2 ("Convert dump pretimeout governor to tristate") could apply
> cleanly on top of the new governor.
> 
> Please let me know what is preferred, or if you'd like me to post
> against a different tree!
> 

Oh, OK.

Guenter, can you please process this patchset?