[Intel-gfx] [PATCH] RFC: drm/i915: Switch obj->mm.lock lockdep annotations on its head

[Chris Wilson]

Quoting Daniel Vetter (2019-08-14 19:49:41)
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
> index d474c6ac4100..1ea3c3c96a5a 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
> @@ -157,7 +157,15 @@ struct drm_i915_gem_object {
>         unsigned int pin_global;
>  
>         struct {
> -               struct mutex lock; /* protects the pages and their use */
> +               /*
> +                * Protects the pages and their use.

"Their use" is still a misleading suggest of mine. This should be
"protects the pinning of pages". The couple of other things it is used
for are tied to the concept of the pages being pinned; further use should
be discouraged; direct use prohibited.
-Chris