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_CPC is a optinal object for processor device so it's fine for processor devices in DSDT without CPPC data, but when booting the system with CPPC enabled in the kernel but without its support in the firmware, I got lots of warnings on a 64 core system: [ 6.346016] acpi ACPI0007:00: CPPC data invalid or not present [ 6.346028] acpi ACPI0007:01: CPPC data invalid or not present [ 6.346039] acpi ACPI0007:02: CPPC data invalid or not present [ 6.346050] acpi ACPI0007:03: CPPC data invalid or not present [ 6.346063] acpi ACPI0007:04: CPPC data invalid or not present ... [ 6.346737] acpi ACPI0007:3f: CPPC data invalid or not present This isn't much useful and a little bit noise, so switch the dev_warn() to dev_dbg(). Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.