[PATCH v9 04/12] arm64/acpi: Create arch specific cpu to acpi id helper

Jeremy Linton jeremy.linton at arm.com
Fri May 11 16:57:59 PDT 2018

Its helpful to be able to lookup the acpi_processor_id associated
with a logical cpu. Provide an arm64 helper to do this.

Signed-off-by: Jeremy Linton <jeremy.linton at arm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Tested-by: Vijaya Kumar K <vkilari at codeaurora.org>
Tested-by: Xiongfeng Wang <wangxiongfeng2 at huawei.com>
Tested-by: Tomasz Nowicki <Tomasz.Nowicki at cavium.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
 arch/arm64/include/asm/acpi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 32f465a80e4e..0db62a4cbce2 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -86,6 +86,10 @@ static inline bool acpi_has_cpu_in_madt(void)
 struct acpi_madt_generic_interrupt *acpi_cpu_get_madt_gicc(int cpu);
+static inline u32 get_acpi_id_for_cpu(unsigned int cpu)
+	return	acpi_cpu_get_madt_gicc(cpu)->uid;
 static inline void arch_fix_phys_package_id(int num, u32 slot) { }
 void __init acpi_init_cpus(void);

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