drm/i915: Catch dirt in unused execbuffer fields
We need to make sure that userspace keeps on following the contract, otherwise we won't be able to use the reserved fields at all. v2: Add DRM_DEBUG (Chris) Testcase: igt/gem_exec_params/*-dirt Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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