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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Replacing the readl() with wmb() in intel_gtt_insert_sg_entries() works. I just
need to explain why the readl() itself doesn't (either the compiler optimises
it away or the CPU does).

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