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Kernel ACPI subsytem introduced the sysfs attributes for acpi cppc library in below path: /sys/devices/system/cpu/cpuX/acpi_cppc/ And these attributes will be used for AMD P-State driver to provide some performance and frequency values. Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>