[PATCH v2 3/6] panic: Allow postponing pre-kdump notifiers

[Guilherme G. Piccoli]

On 28/09/2026 14:55, Zack Rusin wrote:
> Provide an escape hatch for debugging kdump failures that may involve
> pre-kdump callbacks. Add panic_pre_kdump_postpone to skip their early
> invocation in crash core without consuming the once-only guard.
> 
> When enabled, the chain runs before kdump only when
> crash_kexec_post_notifiers is also enabled. Leave the late panic call
> unchanged so callbacks remain eligible if that path is reached.
> Skipping the callbacks may prevent hypervisor crash handling.
> 
> Suggested-by: Guilherme G. Piccoli <gpiccoli at igalia.com>
> Link: https://lore.kernel.org/r/bc0bdd14-5e6a-0676-cd04-14fb0bb93cd5@igalia.com
> Signed-off-by: Zack Rusin <zack.rusin at broadcom.com>
> ---
> New in v2: optional postponement policy suggested by Guilherme.
> 
>  Documentation/admin-guide/kernel-parameters.txt | 14 ++++++++++++++
>  include/linux/panic_notifier.h                  |  1 +
>  kernel/crash_core.c                             |  3 ++-
>  kernel/panic.c                                  |  2 ++
>  4 files changed, 19 insertions(+), 1 deletion(-)
> 

Thanks for implementing this! It makes sense to me...though I have some
"conflicting" comments in patch #2 heh

Cheers,


Guilherme