[Bug 101571] Vulkan tests fail on 4.12 drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101571

--- Comment #4 from Jason Ekstrand <jason at jlekstrand.net> ---
(In reply to Chris Wilson from comment #3)
> It's the use of ASYNC which tells the kernel to skip its implict sync of the
> CPU cache, which vulkan is relying upon by accident to flush the CPU cache
> of render targets.

That makes some sense.  It could also explain the hang issue that someone
reported with the Sascha multithreading demo.

That said, what do you mean by "flushing the CPU cache of render targets"?  Why
does the CPU cache need flushing?

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