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

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Date:   Sun, 5 Jun 2022 09:13:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Mark Brown <broonie@...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 04:17:19PM +0200, Mark Brown wrote:
>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.

Dropped, thanks!

-- 
Thanks,
Sasha