CPU_HAS_PERF_COUNTER
if (!(boot_cpu_data.flags & CPU_HAS_PERF_COUNTER)) {
boot_cpu_data.flags |= CPU_HAS_LLSC | CPU_HAS_PERF_COUNTER;
CPU_HAS_PERF_COUNTER;
CPU_HAS_PERF_COUNTER;
if (!(boot_cpu_data.flags & CPU_HAS_PERF_COUNTER)) {