✗ Fi.CI.BAT: failure for drm/i915: Implement vm_ops->access for gdb access into mmaps (rev3)

[Chris Wilson]

Quoting Patchwork (2020-05-01 00:06:47)
> #### Possible regressions ####
> 
>   * igt at i915_selftest@live at mman:
>     - fi-gdg-551:         [PASS][1] -> [DMESG-FAIL][2]
>    [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8403/fi-gdg-551/igt@i915_selftest@live@mman.html
>    [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17532/fi-gdg-551/igt@i915_selftest@live@mman.html

The nightmare of the incoherent GTT. Nothing much we can do for
userspace (ptracing), but in our selftest we may have to use the
intel_gt_flush_ggtt_writes() hammer?
-Chris