[Intel-gfx] [PATCH 17/42] drm/i915: Pass around sg_table to get_pages/put_pages backend

[Chris Wilson]

On Fri, Oct 14, 2016 at 12:12:32PM +0300, Joonas Lahtinen wrote:
> On pe, 2016-10-07 at 10:46 +0100, Chris Wilson wrote:
> > @@ -2376,6 +2374,19 @@ __deprecated
> >  extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);
> >  
> >  static inline bool
> > +i915_gem_object_is_dead(const struct drm_i915_gem_object *obj)
> > +{
> > +	return atomic_read(&obj->base.refcount.refcount) == 0;
> > +}
> 
> Seems like this ought to be in DRM? Todo item.
> > +
> > +#if IS_ENABLED(CONFIG_LOCKDEP)
> > +#define lockdep_assert_held_unless(lock, cond) \
> > +	GEM_BUG_ON(!lockdep_is_held(lock) && !(cond))
> > +#else
> > +#define lockdep_assert_held_unless(lock, cond)
> > +#endif
> 
> Ugh.

These are temporaries to keep lockdep asserts working until removed later
in the series (but I hope they illustrate the change in locking regime
being prepared for).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre