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Userptr causes lockdep to complain when we are using the aliasing-ppgtt (and ggtt, but for that it is rightfully so to complain about) in that when we revoke the userptr we take a mutex which we also use to revoke the mmaps. However, we only revoke mmaps for GGTT bindings and we never allow userptr to create a GGTT binding so the warning should be false and is simply caused by our conflation of the aliasing-ppgtt with the ggtt. So lets try treating the binding into the aliasing-ppgtt as a separate lockclass from the ggtt. The downside is that we are deliberately suppressing lockdep;s ability to warn us of cycles. Closes: https://gitlab.freedesktop.org/drm/intel/issues/478 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200326142727.31962-1-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.