acpi: Validate processor id when mapping the processor

When we want to identify whether the proc_id is unreasonable or not, we
can call the "acpi_processor_validate_proc_id" function. It will search
in the duplicate IDs. If we find the proc_id in the IDs, we return true
to the call function. Conversely, the false represents available.

When we establish all possible cpuid <-> nodeid mapping to handle the
cpu hotplugs, we will use the proc_id from ACPI table.

We do validation when we get the proc_id. If the result is true, we
will stop the mapping.

[ tglx: Mark the new function __init ]

Signed-off-by: Dou Liyang <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

drivers/acpi/acpi_processor.c

@@ -659,6 +659,21 @@ static void __init acpi_processor_check_duplicates(void)
 						NULL, NULL, NULL);
 }
 
+bool __init acpi_processor_validate_proc_id(int proc_id)
+{
+	int i;
+
+	/*
+	 * compare the proc_id with duplicate IDs, if the proc_id is already
+	 * in the duplicate IDs, return true, otherwise, return false.
+	 */
+	for (i = 0; i < nr_duplicate_ids; i++) {
+		if (duplicate_processor_ids[i] == proc_id)
+			return true;
+	}
+	return false;
+}
+
 void __init acpi_processor_init(void)
 {
 	acpi_processor_check_duplicates();

drivers/acpi/processor_core.c

@@ -302,6 +302,10 @@ map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
 		if (ACPI_FAILURE(status))
 			return false;
 		acpi_id = object.processor.proc_id;
+
+		/* validate the acpi_id */
+		if(acpi_processor_validate_proc_id(acpi_id))
+			return false;
 		break;
 	case ACPI_TYPE_DEVICE:
 		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);