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

From: Julien Grall
Date: Tue Oct 29 2019 - 11:32:46 EST

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

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.


Julien Grall