diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 8c0a54d50d0e9b90eb7b7bf4d7e0ed2e9f97ee9b..333547bf784591ca2454c5455493f1f95eb540b8 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -9,7 +9,9 @@
  *	Yinghai Lu <yinghai@kernel.org>
  *	Jiang Liu <jiang.liu@intel.com>
  */
+#include <linux/percpu.h>
 #include <linux/export.h>
+#include <linux/cpumask.h>
 #include <linux/acpi.h>
 #include <acpi/processor.h>
 
@@ -263,6 +265,20 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 }
 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 
+phys_cpuid_t acpi_id_to_phys_cpuid(u32 acpi_id)
+{
+	int cpu;
+	struct acpi_processor *pr;
+
+	for_each_possible_cpu(cpu) {
+		pr = per_cpu(processors, cpu);
+		if (pr && pr->acpi_id == acpi_id)
+			return pr->phys_id;
+	}
+
+	return PHYS_CPUID_INVALID;
+}
+
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
 			 u64 *phys_addr, int *ioapic_id)
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 1194a4c78d557fb411e9672291f6bab6e3623e9d..9235b41a9d52c41f0e942d5786c4d0a6db95f7b7 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -333,6 +333,7 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id);
 phys_cpuid_t acpi_map_madt_entry(u32 acpi_id);
 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id);
 int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
+phys_cpuid_t acpi_id_to_phys_cpuid(u32 acpi_id);
 
 #ifdef CONFIG_ACPI_CPPC_LIB
 extern int acpi_cppc_processor_probe(struct acpi_processor *pr);