PERF_REG_X86_MAX   13 arch/x86/kernel/perf_regs.c #define PERF_REG_X86_MAX PERF_REG_X86_32_MAX
PERF_REG_X86_MAX   15 arch/x86/kernel/perf_regs.c #define PERF_REG_X86_MAX PERF_REG_X86_64_MAX