PM_UNIT_MSK        20 arch/powerpc/perf/power5+-pmu.c #define PM_UNIT_MSK	0xf
PM_UNIT_MSK        20 arch/powerpc/perf/power5-pmu.c #define PM_UNIT_MSK	0xf
PM_UNIT_MSK        20 arch/powerpc/perf/power6-pmu.c #define PM_UNIT_MSK	0xf
PM_UNIT_MSK        20 arch/powerpc/perf/power7-pmu.c #define PM_UNIT_MSK	0xf
PM_UNIT_MSK        18 arch/powerpc/perf/ppc970-pmu.c #define PM_UNIT_MSK	0xf