Quoting Chris Wilson (2018-10-03 13:28:09)
> Quoting Tvrtko Ursulin (2018-10-03 10:58:55)
> > +static int
> > +query_engine_info(struct drm_i915_private *i915,
> > + struct drm_i915_query_item *query_item)
> > +{
> > + for_each_engine(engine, i915, id) {
> > + struct drm_i915_engine_info info;
> > +
> > + if (__copy_from_user(&info, info_ptr, sizeof(info)))
> > + return -EFAULT;
> > +
> > + if (memcmp(&info, &zero_info, sizeof(info)))
> > + return -EINVAL;
>
> You want to have this be an in/out?
Fwiw, you can use memchr_inv() instead of having a zeroed struct.
-Chris
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