Re: [PATCH AUTOSEL 5.18 063/159] arm64/sme: Add ID_AA64SMFR0_EL1 to __read_sysreg_by_encoding()

[Mark Brown]

On Mon, May 30, 2022 at 09:22:48AM -0400, Sasha Levin wrote:
> From: Mark Brown <broonie@xxxxxxxxxx>
> 
> [ 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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