[Bug 78453] [HAWAII] Get acceleration working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78453

--- Comment #48 from Michel Dänzer <michel at daenzer.net> ---
(In reply to comment #42)
> There is only one buffer_map(READ), in si_get_backend_mask, right after the
> buffer_map(WRITE) from si_get_backend_mask.

Please make sure the kernel has the commit(s) necessary to provide the backend
mask to userspace, so si_get_backend_mask() doesn't need to fall back to this
method.

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