MSR_K7_HWCR_IRPERF_EN_BIT  518 arch/x86/include/asm/msr-index.h #define MSR_K7_HWCR_IRPERF_EN		BIT_ULL(MSR_K7_HWCR_IRPERF_EN_BIT)
MSR_K7_HWCR_IRPERF_EN_BIT  990 arch/x86/kernel/cpu/amd.c 		msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);