From: Chengwen Feng Date: Wed, 1 Apr 2026 08:16:34 +0000 (+0800) Subject: LoongArch: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d78ef9d2e1f2c7e0b69c102fc2867e8daa5612ed;p=thirdparty%2Fkernel%2Flinux.git LoongArch: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval As a step towards unifying the interface for retrieving ACPI CPU UID across architectures, introduce a new function acpi_get_cpu_uid() for loongarch. While at it, add input validation to make the code more robust. Signed-off-by: Chengwen Feng Reviewed-by: Jonathan Cameron Link: https://patch.msgid.link/20260401081640.26875-3-fengchengwen@huawei.com Signed-off-by: Rafael J. Wysocki --- diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h index 7376840fa9f78..8bb101b4557e1 100644 --- a/arch/loongarch/include/asm/acpi.h +++ b/arch/loongarch/include/asm/acpi.h @@ -44,6 +44,7 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu) { return acpi_core_pic[cpu_logical_map(cpu)].processor_id; } +int acpi_get_cpu_uid(unsigned int cpu, u32 *uid); #endif /* !CONFIG_ACPI */ diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c index 1367ca759468f..058f0dbe8e8f9 100644 --- a/arch/loongarch/kernel/acpi.c +++ b/arch/loongarch/kernel/acpi.c @@ -385,3 +385,12 @@ int acpi_unmap_cpu(int cpu) EXPORT_SYMBOL(acpi_unmap_cpu); #endif /* CONFIG_ACPI_HOTPLUG_CPU */ + +int acpi_get_cpu_uid(unsigned int cpu, u32 *uid) +{ + if (cpu >= nr_cpu_ids) + return -EINVAL; + *uid = acpi_core_pic[cpu_logical_map(cpu)].processor_id; + return 0; +} +EXPORT_SYMBOL_GPL(acpi_get_cpu_uid);