[Bug 92975] [SKL][v4.3 bisected]SKL OpenCL performance reduced hugely

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92975

meng <mengmeng.meng at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #6 from meng <mengmeng.meng at intel.com> ---
Just check, "CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT=y" is in our .config(both
v4.3 and pre_v4.3).

try the above patch on the first bad commit, the OpenCL performance issues
can't be reproduced. 
BTW, no the patch, no "*ERROR* MOCS failed" in dmesg.
if with the patch, there is "*ERROR* MOCS failed

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