[PATCH] arm64/sme: Add hwcap for Scalable Matrix Extension

[Tianjia Zhang]

Hi Marc,

On 4/14/22 8:06 PM, Marc Zyngier wrote:
> On Thu, 14 Apr 2022 12:55:44 +0100,
> Tianjia Zhang <tianjia.zhang at linux.alibaba.com> wrote:
>>
>> Allow userspace to detect support for SME (Scalable Matrix Extension)
>> by providing a hwcap for it, using the official feature name FEAT_SME,
>> declared in ARM DDI 0487H.a specification.
> 
> Err, not just that, for sure. What does this patch buys you on its
> own, given that the kernel doesn't implement anything yet and that all
> the SME instructions will UNDEF?
> 
> [1] is the real deal.
> 
> Thanks,
> 
> 	M.
> 
> [1] https://lore.kernel.org/r/20220408114328.1401034-1-broonie@kernel.org
> 

Thanks for your suggestion, I have a very simple scenario, I can see
whether the SME feature is supported in cpuinfo, it seems impractical at
the moment.

Kind regards,
Tianjia