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When _PPC returns 0, it means that the CPU frequency is not limited by the platform firmware, so make acpi_processor_get_platform_limit() update the frequency QoS request used by it to "no limit" in that case. This addresses a problem with limiting CPU frequency artificially on some systems after CPU offline/online to the frequency that corresponds to the first entry in the _PSS return package. Reported-by: Pratyush Yadav <ptyadav@amazon.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Pratyush Yadav <ptyadav@amazon.de> Tested-by: Pratyush Yadav <ptyadav@amazon.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.