oprofile: Make op_name_from_perf_id() global

Make op_name_from_perf_id() global so that we have a way for each
architecture to construct an oprofile name for op->cpu_type. We need to
remove the argument from the function prototype so that we can hide all
implementation details inside the function.
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Robert Richter <robert.richter@amd.com>

arch/arm/oprofile/common.c

@@ -155,8 +155,10 @@ static void op_perf_stop(void)
 }
 
 
-static char *op_name_from_perf_id(enum arm_perf_pmu_ids id)
+char *op_name_from_perf_id(void)
 {
+	enum arm_perf_pmu_ids id = armpmu_get_pmu_id();
+
 	switch (id) {
 	case ARM_PERF_PMU_ID_XSCALE1:
 		return "arm/xscale1";
@@ -391,7 +393,7 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
 	ops->start		= op_arm_start;
 	ops->stop		= op_arm_stop;
 	ops->shutdown		= op_arm_stop;
-	ops->cpu_type		= op_name_from_perf_id(armpmu_get_pmu_id());
+	ops->cpu_type		= op_name_from_perf_id();
 
 	if (!ops->cpu_type)
 		ret = -ENODEV;

include/linux/oprofile.h

@@ -185,4 +185,8 @@ int oprofile_add_data(struct op_entry *entry, unsigned long val);
 int oprofile_add_data64(struct op_entry *entry, u64 val);
 int oprofile_write_commit(struct op_entry *entry);
 
+#ifdef CONFIG_PERF_EVENTS
+char *op_name_from_perf_id(void);
+#endif /* CONFIG_PERF_EVENTS */
+
 #endif /* OPROFILE_H */