arm64: Kconfig: Enable hotplug CPU on arm64 if ACPI_PROCESSOR is enabled.

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In order to move arch_register_cpu() to be called via the same path
for initially present CPUs described by ACPI and hotplugged CPUs
ACPI_HOTPLUG_CPU needs to be enabled.

The protection against invalid IDs in acpi_map_cpu() is needed as
at least one production BIOS is in the wild which reports entries
in DSDT (with no _STA method, so assumed enabled and present)
that don't match MADT.

Tested-by: Miguel Luis <miguel.luis@oracle.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240529133446.28446-18-Jonathan.Cameron@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Jonathan Cameron 2024-05-29 14:34:44 +01:00 • committed by Catalin Marinas

parent eba4675008

commit 9d0873892f

2 changed files with 23 additions and 0 deletions

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arch/arm64/Kconfig

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arch/arm64/kernel/acpi.c

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