On Mon, Jan 23, 2023 at 11:05 PM Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > > Add a few 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> > Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Tested-by: Alexander Potapenko <glider@xxxxxxxxxx>
