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描述 树莓派内核编译未启用 CONFIG_ACPI，编译时报错信息：
arch/arm64/kernel/smp.c: In function ‘smp_prepare_cpus’:
arch/arm64/kernel/smp.c:955:9: error: ‘cpu_madt_gicc’ undeclared (first use in this function)
if ((cpu_madt_gicc[cpu].flags & ACPI_MADT_ENABLED))
^
arch/arm64/kernel/smp.c:955:9: note: each undeclared identifier is reported only once for each function it appears in
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已定位解决：
补丁arm64: mark all the GICC nodes in MADT as possible cpu引入问题，
修复补丁：arm64: fix compile error when CONFIG_ACPI is not enabled已合入
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