amd_get_highest_perf
EXPORT_SYMBOL_GPL(amd_get_highest_perf);
ret = amd_get_highest_perf(cpu, &tmp);
ret = amd_get_highest_perf(cpu, &tmp);
if (amd_get_highest_perf(cpu, &cur_high))
extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);