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44a2d56429
The normal DRM vblank interrupt events started using monotonic times in
commit c61eef726a ("drm: add support for monotonic vblank timestamps"),
which is useful for a number of reasons, including the possible y2038
overflow.
The VIA_WAIT_IRQ ioctl uses the same drm_wait_vblank_reply as
DRM_IOCTL_WAIT_VBLANK, but still uses wall-clock time.
This converts it to using monotonic time as well, which is more
consistent, and avoids problems with the y2038 overflow as well
as synchronization issues when the real time skips.
I could not find the matching user space that calls the VIA_WAIT_IRQ
ioctl to verify that this is safe, but it very likely is. Please
either test or review the user space side before applying this.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171127111728.1710742-1-arnd@arndb.de
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.