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A simple mutex used for guarding the flow of requests in and out of the timeline. In the short-term, it will be used only to guard the addition of requests into the timeline, taken on alloc and released on commit so that only one caller can construct a request into the timeline (important as the seqno and ring pointers must be serialised). This will be used by observers to ensure that the seqno/hwsp is stable. Later, when we have reduced retiring to only operate on a single timeline at a time, we can then use the mutex as the sole guard required for retiring. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190301110547.14758-2-chris@chris-wilson.co.uk
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.