I915_MAP_OVERRIDE
I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
pinned = !(type & I915_MAP_OVERRIDE);
type &= ~I915_MAP_OVERRIDE;
I915_MAP_OVERRIDE);