On Sat, Dec 13, 2025 at 11:14:05AM +0100, Mauro Carvalho Chehab wrote:

Hi Sacha,

Em Sat, 13 Dec 2025 04:49:42 -0500 Sasha Levin sashal@kernel.org escreveu:

...

This is a note to let you know that I've just added the patch titled

RAS: Report all ARM processor CPER information to userspace

to the 6.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ras-report-all-arm-processor-cper-information-to-use.patch and it can be found in the queue-6.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

You should also backport this patch(*):

96b010536ee0 efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs

It fixes a bug at the UEFI parser for the ARM Processor Error record: basically, the specs were not clear about how the error type should be reported. The Kernel implementation were assuming that this was an enum, but UEFI errata 2.9A make it clear that the value is a bitmap.

So, basically, all kernels up to 6.18 are not parsing the field the expected way: only "Cache error" was properly reported. The other 3 types were wrong.

(*) You could need to backport those patches as well:

a976d790f494 efi/cper: Add a new helper function to print bitmasks 8ad2c72e21ef efi/cper: Adjust infopfx size to accept an extra space

Sure, I'll grab those too. Thanks!