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All CPUs in a package are represented in an HFI table. There exists an HFI table per package. Thus, CPUs in a package need to coordinate to initialize and access the table. Do such coordination during CPU hotplug. Use the first CPU to come online in a package to initialize the HFI instance and the data structure representing it. Other CPUs in the same package need only to register or unregister themselves in that data structure. The HFI depends on both the package-level thermal management and the local APIC thermal local vector. Thus, to ensure that a CPU coming online has an associated HFI instance when the hardware issues an HFI event, enable the HFI only after having enabled the local APIC thermal vector. The thermal throttle driver takes care of the needed package-level initialization. Reviewed-by: Len Brown <len.brown@intel.com> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> 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.