[Bug 88191] [PNV Bisected]igt/gem_exec_big fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88191

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
Disassembling intel_gtt_insert_sg_entries() shows that the readl() is not
optimised away, so the issue appears to be that it is simply not an adequate
barrier. Seems strange.

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