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When we return pages to the system, we release control over them and should defensively return them to the CPU write domain so that we catch any external writes on reacquiring them (e.g. to transparently swapout/swapin). While we did this defensive clflushing for ordinary shmem pages, it was forgotten for userptr. Fortunately, userptr objects are normally cache coherent and so oblivious to the forgotten domain tracking. References:a679f58d05("drm/i915: Flush pages on acquisition") References:754a254427("drm/i915: Skip object locking around a no-op set-domain ioctl") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.william.auld@gmail.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190331094620.15185-1-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.