Re: [PATCH] arm64: cpufeature: Export Armv8.6 Matrix feature to userspace

[Julien Grall]

Hi Will,

On 29/10/2019 11:36, Will Deacon wrote:
> On Tue, Oct 29, 2019 at 11:26:41AM +0000, Julien Grall wrote:
> > On 29/10/2019 11:15, Will Deacon wrote:
> > > On Fri, Oct 25, 2019 at 06:10:56PM +0100, Julien Grall wrote:
> > > > This patch provides support for reporting the presence of Armv8.6
> > > > Matrix and its optional features to userspace.
> > >
> > > Are you sure this is 8.6 and not earlier?
> >
> > This was introduced by Armv8.6 see [1] but allowed to be used by Armv8.2 and
> > onwards.
>
> That doesn't mean an awful lot though, especially then the features are
> referred to in the docs as things like "ARMv8.2-F64MM".

It is arguable. The feature were announced for Armv8.6 but made available for 
previous release.

Anyway, I can remove the "Armv8.6" bits if that's the concern.

Cheers,

--
Julien Grall