arm64: cpufeatures: Add missing ID_AA64MMFR4_EL1 to __read_sysreg_by_encoding()

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When triggering a CPU hotplug scenario, we reparse the CPU feature
with SCOPE_LOCAL_CPU, for which we use __read_sysreg_by_encoding()
to get the HW value for this CPU.

As it turns out, we're missing the handling for ID_AA64MMFR4_EL1,
and trigger a BUG(). Funnily enough, Marek isn't completely happy
about that.

Add the damn register to the list.

Fixes: 805bb61f82 ("arm64: cpufeature: Add ID_AA64MMFR4_EL1 handling")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240212144736.1933112-2-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

...

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Marc Zyngier 2024-02-12 14:47:35 +00:00 • committed by Oliver Upton

parent aade38faca

commit 87b8cf2387

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arch/arm64/kernel/cpufeature.c

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