linux-kernel - Re: [PATCH v3] arm64/sme: Move storage of reg_smidr to __cpuinfo_store

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Message-Id: <173627015564.294742.14608056095112096112.b4-ty@kernel.org>
Date: Wed,  8 Jan 2025 16:38:52 +0000
From: Will Deacon <will@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Peter Collingbourne <pcc@...gle.com>,
	Mark Brown <broonie@...nel.org>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v3] arm64/sme: Move storage of reg_smidr to __cpuinfo_store_cpu()

On Tue, 17 Dec 2024 21:59:48 +0000, Mark Brown wrote:
> In commit 892f7237b3ff ("arm64: Delay initialisation of
> cpuinfo_arm64::reg_{zcr,smcr}") we moved access to ZCR, SMCR and SMIDR
> later in the boot process in order to ensure that we don't attempt to
> interact with them if SVE or SME is disabled on the command line.
> Unfortunately when initialising the boot CPU in init_cpu_features() we work
> on a copy of the struct cpuinfo_arm64 for the boot CPU used only during
> boot, not the percpu copy used by the sysfs code. The expectation of the
> feature identification code was that the ID registers would be read in
> __cpuinfo_store_cpu() and the values not modified by init_cpu_features().
> 
> [...]

SME is still disabled, but this is straightforward enough and I don't
want to lose track of it so I've applied it to arm64
(for-next/cpufeature), thanks!

[1/1] arm64/sme: Move storage of reg_smidr to __cpuinfo_store_cpu()
      https://git.kernel.org/arm64/c/d3c7c48d004f

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev