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Explain how the GS/FS based addressing can be utilized in user space applications along with the differences between the generic prctl() based GS/FS base control and the FSGSBASE version available on newer CPUs. Originally-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: "Bae, Chang Seok" <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@kernel.org>, Cc: H . Peter Anvin <hpa@zytor.com> Cc: "Shankar, Ravi V" <ravi.v.shankar@intel.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Jonathan Corbet <corbet@lwn.net> Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1906132246310.1791@nanos.tec.linutronix.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.