[PATCH v3 01/12] kexec: Add a crash memaction registry

[sashiko-bot at kernel.org]

> Add a registry identifying page use to a kdump kernel. Intended uses are
> wiping of crypto keys on crash, or omitting pages holding e.g. crypto
> keys or unimportant caches from crash dumps.
> 
> The registry is a bitmap with one bit for each physical page. The
> meaning of the bits is set by the crash_memaction= cmdline param. When
> not present, no bitmap is allocated. Marking is a lock-free bitmap
> update with no allocation, so it is safe from any context.
> 
> The bitmap and its metadata is handed over to the kdump kernel through
> elfcorehdr.
> 
> Signed-off-by: Jan Sebastian Götte <linux at jaseg.de>

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

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Sashiko AI review · https://sashiko.dev/#/patchset/20260928-crash-memaction-upstream-20260921-v3-0-e511e9ee2329@jaseg.de?part=1