HW_OP_UNSUPPORTED   98 arch/alpha/kernel/perf_event.c #define HW_OP_UNSUPPORTED -1
HW_OP_UNSUPPORTED  713 arch/csky/kernel/perf_event.c #define HW_OP_UNSUPPORTED	0xffff
HW_OP_UNSUPPORTED   13 arch/nds32/include/asm/pmu.h #define HW_OP_UNSUPPORTED		0x0
HW_OP_UNSUPPORTED   30 include/linux/perf/arm_pmu.h #define HW_OP_UNSUPPORTED		0xFFFF