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4f37ab5e05
Currently arch_acpi_set_proc_cap_bits() clears ACPI_PDC_C_C2C3_FFH bit in case MWAIT instruction is not supported. It should also clear ACPI_PDC_C_C1_FFH, as when MWAIT is not supported, C1 is entered by executing the HLT instruction. Quote from the C_C1_FFH description: "If set, OSPM is capable of performing native C State instructions (beyond halt) for the C1 handler in multi-processor configurations". As without MWAIT there is no native C-state instructions beyond HALT, this bit should be toggled off." Clear ACPI_PDC_C_C1_FFH and ACPI_PDC_C_C2C3_FFH in arch_acpi_set_proc_cap_bits() in case MWAIT is not supported or overridden. Remove setting those bits from the processor_pdc.c code. Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com> [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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.