ACPI: Centralize acpi_get_cpu_uid() declaration in include/linux/acpi.h

Centralize acpi_get_cpu_uid() in include/linux/acpi.h (global scope) and
remove arch-specific declarations from arm64/loongarch/riscv/x86
asm/acpi.h. This unifies the interface across architectures and
simplifies maintenance by eliminating duplicate prototypes.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260401081640.26875-6-fengchengwen@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: fengchengwen

arch/arm64/include/asm/acpi.h

@@ -118,7 +118,6 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu)
 {
 	return	acpi_cpu_get_madt_gicc(cpu)->uid;
 }
-int acpi_get_cpu_uid(unsigned int cpu, u32 *uid);
 int get_cpu_for_acpi_id(u32 uid);
 
 static inline void arch_fix_phys_package_id(int num, u32 slot) { }

arch/loongarch/include/asm/acpi.h

@@ -44,7 +44,6 @@ 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 */
 

arch/riscv/include/asm/acpi.h

@@ -65,7 +65,6 @@ static inline u32 get_acpi_id_for_cpu(int cpu)
 {
 	return acpi_cpu_get_madt_rintc(cpu)->uid;
 }
-int acpi_get_cpu_uid(unsigned int cpu, u32 *uid);
 
 int acpi_get_riscv_isa(struct acpi_table_header *table,
 		       unsigned int cpu, const char **isa);

arch/x86/include/asm/acpi.h

@@ -157,8 +157,6 @@ static inline bool acpi_has_cpu_in_madt(void)
 	return !!acpi_lapic;
 }
 
-int acpi_get_cpu_uid(unsigned int cpu, u32 *uid);
-
 #define ACPI_HAVE_ARCH_SET_ROOT_POINTER
 static __always_inline void acpi_arch_set_root_pointer(u64 addr)
 {

include/linux/acpi.h

@@ -324,6 +324,17 @@ int acpi_unmap_cpu(int cpu);
 
 acpi_handle acpi_get_processor_handle(int cpu);
 
+/**
+ * acpi_get_cpu_uid() - Get ACPI Processor UID of from MADT table
+ * @cpu: Logical CPU number (0-based)
+ * @uid: Pointer to store ACPI Processor UID
+ *
+ * Return: 0 on success (ACPI Processor ID stored in *uid);
+ *         -EINVAL if CPU number is invalid or out of range;
+ *         -ENODEV if ACPI Processor UID for the CPU is not found.
+ */
+int acpi_get_cpu_uid(unsigned int cpu, u32 *uid);
+
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
 #endif