Re: Patch "RAS: Report all ARM processor CPER information to userspace" has been added to the 6.18-stable tree

Re: Patch "RAS: Report all ARM processor CPER information to userspace" has been added to the 6.18-stable tree

[Mauro Carvalho Chehab]

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;a=summary
> 
> 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


Regards,
Mauro

Thanks,
Mauro

Re: Patch "RAS: Report all ARM processor CPER information to userspace" has been added to the 6.18-stable tree

[Sasha Levin]

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;a=summary
>>
>> 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!

-- 
Thanks,
Sasha