Quoting Lionel Landwerlin (2017-10-24 16:27:28)
> The compat callback was missing and triggered failures in 32bits
> userspace when enabling/disable the perf stream. We don't require any
> particular processing here as these ioctls don't take any argument.
>
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
> Fixes: eec688e1420 ("drm/i915: Add i915 perf infrastructure")
> Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris