Re: [PATCH 05/11] x86/fpu: set PKRU state for kernel threads

[Dave Hansen]

On 10/18/2018 09:48 AM, Andy Lutomirski wrote:
>>>> We might want to do this for cleanliness reasons...  Maybe.
>>>>
>>>> But this *should* have no practical effects.  Kernel threads have no
>>>> real 'mm' and no user pages.  They should not have do access to user
>>>> mappings.  Protection keys *only* apply to user mappings.  Thus,
>>>> logically, they should never be affected by PKRU values.
>>>>
>>>> So I'm kinda missing the point of the patch.
>>> use_mm().
>> So. I would drop that patch from queue. Anyone feels different about it?
>>
> I think we *do* want the patch. Itâs a bugfix for use_mm users, right?

Yes, we need it.  I was being dense and Andy kindly reminded me of the
point of the patch.