linux-kernel - Re: [PATCH] arm64/sme: Add hwcap for Scalable Matrix Extension

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Message-ID: <875ynbc1je.wl-maz@kernel.org>
Date:   Thu, 14 Apr 2022 13:06:13 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jonathan Corbet <corbet@....net>,
        Joey Gouly <joey.gouly@....com>,
        Vincenzo Frascino <Vincenzo.Frascino@....com>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Fuad Tabba <tabba@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/sme: Add hwcap for Scalable Matrix Extension

On Thu, 14 Apr 2022 12:55:44 +0100,
Tianjia Zhang <tianjia.zhang@...ux.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

-- 
Without deviation from the norm, progress is not possible.