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| author | Chengwen Feng <fengchengwen@huawei.com> | 2026-04-01 11:16:34 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-04-06 17:55:15 +0300 |
| commit | d78ef9d2e1f2c7e0b69c102fc2867e8daa5612ed (patch) | |
| tree | f7f58aa30260b3f7d2280e9f5b76f0a978605fae | |
| parent | 7cd5f5659ac8e49811ef03cbfe8b4a2069abaa27 (diff) | |
| download | linux-d78ef9d2e1f2c7e0b69c102fc2867e8daa5612ed.tar.xz | |
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 <fengchengwen@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260401081640.26875-3-fengchengwen@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | arch/loongarch/include/asm/acpi.h | 1 | ||||
| -rw-r--r-- | arch/loongarch/kernel/acpi.c | 9 |
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h index 7376840fa9f7..8bb101b4557e 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 1367ca759468..058f0dbe8e8f 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); |