[PATCH v2 1/6] panic: Add a notifier chain for pre-kdump callbacks

[sashiko-bot at kernel.org]

> Selected crash callbacks should not require running every panic notifier
> before kdump. Add a separate atomic chain with an at-most-once dispatch
> helper, and invoke it before panic reaches the kmsg dumpers.
> 
> The helper permits another call from the crash path without repeating
> callbacks or recursing into them. Document that callbacks may run in NMI
> context, with other CPUs running and the kexec lock held.
> 
> Link: https://lore.kernel.org/r/aquttpMVKX8e6zGB@pathway.suse.cz
> Signed-off-by: Zack Rusin <zack.rusin at broadcom.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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