kernel/drivers/cpufreq/Kconfig.x86
.. .. @@ -125,7 +125,7 @@ 125 125 126 126 config X86_POWERNOW_K8 127 127 tristate "AMD Opteron/Athlon64 PowerNow!" 128 - depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ128 + depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE129 129 help 130 130 This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. 131 131 Support for K10 and newer processors is now in acpi-cpufreq.