Re: [PATCHv6 06/11] x86/mm: Provide arch_prctl() interface for LAM

[Alexander Potapenko]

On Mon, Aug 22, 2022 at 11:32 AM Alexander Potapenko <glider@xxxxxxxxxx> wrote:
>
> On Mon, Aug 15, 2022 at 6:15 AM Kirill A. Shutemov
> <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> >
> > Add a couple of arch_prctl() handles:
> >
> >  - ARCH_ENABLE_TAGGED_ADDR enabled LAM. The argument is required number
> >    of tag bits. It is rounded up to the nearest LAM mode that can
> >    provide it. For now only LAM_U57 is supported, with 6 tag bits.
> >
> >  - ARCH_GET_UNTAG_MASK returns untag mask. It can indicates where tag
> >    bits located in the address.
> >
> >  - ARCH_GET_MAX_TAG_BITS returns the maximum tag bits user can request.
> >    Zero if LAM is not supported.
> >
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
And also:

Tested-by: Alexander Potapenko <glider@xxxxxxxxxx>