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Jarred White 6a8fda8a73 ACPI: CPPC: Fix bit_offset shift in MASK_VAL() macro commit `05d92ee782` upstream. Commit `2f4a4d63a1` ("ACPI: CPPC: Use access_width over bit_width for system memory accesses") neglected to properly wrap the bit_offset shift when it comes to applying the mask. This may cause incorrect values to be read and may cause the cpufreq module not be loaded. [ 11.059751] cpu_capacity: CPU0 missing/invalid highest performance. [ 11.066005] cpu_capacity: partial information: fallback to 1024 for all CPUs Also, corrected the bitmask generation in GENMASK (extra bit being added). Fixes: `2f4a4d63a1` ("ACPI: CPPC: Use access_width over bit_width for system memory accesses") Signed-off-by: Jarred White <jarredwhite@linux.microsoft.com> Cc: 5.15+ <stable@vger.kernel.org> # 5.15+ Reviewed-by: Vanshidhar Konda <vanshikonda@os.amperecomputing.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2024-05-02 16:32:46 +02:00
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README

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.