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[Why] Cursor updates can be preempted by queued flips in some DMs. The synchronization model causes this to occur within the same thread at an intermediate level when we insert logs into the OS queue. Since this occurs on the same thread and we're still holding the lock (recursively) the cache is coherent. The exit sequence will run twice since we technically haven't finished the exit the first time, so we need a way to detect and avoid the reallow in the middle of this call to prevent the hang on the cursor update that was preempted. [How] Keep a counter that tracks the depth of the exit calls. Do not reallow until the counter is zero. Reviewed-by: Duncan Ma <duncan.ma@amd.com> Acked-by: Wayne Lin <wayne.lin@amd.com> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.