PERF_REG_X86_32_MAX   13 arch/x86/kernel/perf_regs.c #define PERF_REG_X86_MAX PERF_REG_X86_32_MAX
PERF_REG_X86_32_MAX   13 tools/perf/arch/x86/include/perf_regs.h #define PERF_REGS_MASK ((1ULL << PERF_REG_X86_32_MAX) - 1)