linux-kernel - Re: [PATCH AUTOSEL 5.18 063/159] arm64/sme: Add ID_AA64SMFR0_EL1 to __read_sysreg_by

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Date:   Mon, 30 May 2022 16:17:19 +0200
From:   Mark Brown <broonie@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Catalin Marinas <catalin.marinas@....com>, will@...nel.org,
        maz@...nel.org, mark.rutland@....com, vladimir.murzin@....com,
        joey.gouly@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 5.18 063/159] arm64/sme: Add ID_AA64SMFR0_EL1 to
 __read_sysreg_by_encoding()

On Mon, May 30, 2022 at 09:22:48AM -0400, Sasha Levin wrote:
> From: Mark Brown <broonie@...nel.org>
> 
> [ Upstream commit 8a58bcd00e2e8d46afce468adc09fcd7968f514c ]
> 
> We need to explicitly enumerate all the ID registers which we rely on
> for CPU capabilities in __read_sysreg_by_encoding(), ID_AA64SMFR0_EL1 was
> missed from this list so we trip a BUG() in paths which rely on that
> function such as CPU hotplug. Add the register.

> +	read_sysreg_case(SYS_ID_AA64SMFR0_EL1);

This won't build on v5.18 since it does not contain SME support
and therefore lacks the definition for the SME feature register.

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