linux-kernel - Re: [PATCH v6 2/9] arm64: report address tag when FEAT_MTE_TAGGED

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Message-ID: <a11fc436-9952-4391-a3ec-ad359fabe8bc@sirena.org.uk>
Date: Wed, 11 Jun 2025 13:35:22 +0100
From: Mark Brown <broonie@...nel.org>
To: Yeo Reum Yun <YeoReum.Yun@....com>
Cc: Catalin Marinas <Catalin.Marinas@....com>,
	"pcc@...gle.com" <pcc@...gle.com>,
	"will@...nel.org" <will@...nel.org>,
	Anshuman Khandual <Anshuman.Khandual@....com>,
	Joey Gouly <Joey.Gouly@....com>,
	Yury Khrustalev <Yury.Khrustalev@....com>,
	"maz@...nel.org" <maz@...nel.org>,
	"oliver.upton@...ux.dev" <oliver.upton@...ux.dev>,
	"frederic@...nel.org" <frederic@...nel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"surenb@...gle.com" <surenb@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v6 2/9] arm64: report address tag when
 FEAT_MTE_TAGGED_FAR is supported

On Wed, Jun 11, 2025 at 12:19:57PM +0000, Yeo Reum Yun wrote:
> Hi Mark,
> 
> > > +HWCAP3_MTE_FAR
> >
> > > +    Functionality implied by ID_AA64PFR2_EL1.MTEFAR == 0b0001.
> > > +Applications should interpret the values of these bits based on
> > > +the support for the 'mte_far' hwcap. If the support is not present,
> > > +the values of these bits should be considered as undefined otherwise valid.
> >
> > The constant is HWCAP3_MTE_FAR and the cpuinfo is mtefar:
> >
> > +     [KERNEL_HWCAP_MTE_FAR]          = "mtefar",
> >
> > The reference to the hwcap should probably be one of these, I'd go for
> > HWCAP3_MTE_FAR since it says hwcap.

> Just for confirmation. so change to "mtefar" -> "mte_far"
> Am I missing?

I'd write it as HWCAP3_MTE_FAR since that's the thing you're
referencing.

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