Re: [PATCH 1/2] nmi: Export CPU backtrace APIs for loadable modules

Doug Anderson <[email protected]> Thu, 30 Jul 2026 18:54:13 -0700

Newsgroups	org.kernel.vger.linux-watchdog,org.kernel.vger.linux-kernel
Message-ID	<CAD=FV=VXC7LQOERckkZJfcSDuDiGALaG8Z7RcfOZQOsGYFCaWQ@mail.gmail.com>

Hi,

On Thu, Jul 30, 2026 at 3:00=E2=80=AFPM Mayank Rungta via B4 Relay
<[email protected]> wrote:
>
> From: Mayank Rungta <[email protected]>
>
> Currently, CPU backtrace functions cannot be called from loadable
> modules because the underlying helper arch_trigger_cpumask_backtrace()
> is not exported.
>
> Instead of exporting arch_trigger_cpumask_backtrace() individually
> across every supported architecture, introduce and export a common
> helper, cpumask_backtrace(), in lib/nmi_backtrace.c. Update the four
> inline CPU backtrace macros in include/linux/nmi.h to route through this
> centralized helper.
>
> Signed-off-by: Mayank Rungta <[email protected]>
> ---
>  include/linux/nmi.h | 10 ++++++----
>  lib/nmi_backtrace.c |  7 +++++++
>  2 files changed, 13 insertions(+), 4 deletions(-)

Reviewed-by: Douglas Anderson <[email protected]>