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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
The magic so far:

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index c7f4048..e5a6d52 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -332,6 +332,8 @@ relocate_entry_gtt(struct drm_i915_gem_object *obj,
        if (ret)
                return ret;

+       mb();
+
        /* Map the page containing the relocation we're going to perform.  */
        offset = i915_gem_obj_ggtt_offset(obj);
        offset += reloc->offset;

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