[Intel-gfx] Add warning for nesting dma_fence containers

[Thomas Hellström]

On Fri, 2022-02-04 at 11:04 +0100, Christian König wrote:
> Hi everyone,
> 
> Since some operations can then lead to recursive handling nesting
> dma_fence containers into each other is only allowed under some
> restrictions.
> 
> dma_fence_array containers can be attached to dma_fence_chain
> containers and dma_fence_chain containers by chaining them together.
> 
> In all other cases the individual fences should be extracted with
> the appropriate iterators and added to the new containers
> individually.
> 
> I've separated the i915 cleanup from this change since it is
> generally a different functionality and the build bots complained
> about some issues with those patches.
> 
> Most patches are already reviewd, but especially the first one still
> needs an rb tag.
> 
> Please review and comment,

I see you dropped the i915 patch (probably due to lack of reviews?),
Got distracted with other things, but I'll see if I can resurrect that
and get it reviewed and merged.

Thanks, 
Thomas


> Christian.
> 
>