[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 #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Any new bo returned to userspace is zeroed. That data may entirely reside in
the CPU cache, and may remain there across the GPU write into main memory. The
clflush performed before the read to invalidate the cache may in fact just
cause the writeback of the cache to main memory, overwriting the results.

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