linux-kernel - Re: [PATCH v4 5/9] arm64/sysreg: Update ID_AA64SMFR0

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Message-ID: <9e93418d-ef66-42bb-b276-9f92da2596fa@sirena.org.uk>
Date: Tue, 7 Jan 2025 15:26:34 +0000
From: Mark Brown <broonie@...nel.org>
To: Will Deacon <will@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Jonathan Corbet <corbet@....net>, Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Shuah Khan <shuah@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 5/9] arm64/sysreg: Update ID_AA64SMFR0_EL1 to DDI0601
 2024-09

On Tue, Jan 07, 2025 at 03:13:24PM +0000, Will Deacon wrote:
> On Wed, Dec 11, 2024 at 01:02:50AM +0000, Mark Brown wrote:

> > -Res0	27:0
> > +UnsignedEnum	27	SF8MM8
> > +	0b0	NI
> > +	0b1	IMP
> > +EndEnum
> > +UnsignedEnum	26	SF8MM4
> > +	0b0	NI
> > +	0b1	IMP
> > +EndEnum

> afaict, bits 27 and 26 are still RES0 in all the documentation I can
> find...

They're in the 2024-09 XML release here:

   https://developer.arm.com/documentation/ddi0601/2024-09/AArch64-Registers/ID-AA64SMFR0-EL1--SME-Feature-ID-Register-0?lang=en

which was current at the time the series was sent but I see that they've
been removed in the 2024-12 release which came out later, right at the
end of last year:

   https://developer.arm.com/documentation/ddi0601/2024-12/AArch64-Registers/ID-AA64SMFR0-EL1--SME-Feature-ID-Register-0?lang=en

so we should just remove these.  I'll respin (or should I do it
incrementally to save on re-review of the rest of it?).

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