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Avoid waking up the device and taking stale locks if we know that the object is not currently mmapped. This is particularly useful as not many object are actually mmapped and so we can destroy them without waking the device up, and gives us a little more freedom of workqueue ordering during shutdown. v2: Pull the release_mmap() into its single user in freeing the objects, where there can not be any race with a concurrent user of the freed object. Or so one hopes! Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>, Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>, Link: https://patchwork.freedesktop.org/patch/msgid/20200702163623.6402-2-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.