Re: [PATCH 04/15] dma-fence: Make ->wait callback optional

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On Fri, May 04, 2018 at 10:17:22AM +0200, Daniel Vetter wrote:
> On Fri, May 04, 2018 at 09:09:10AM +0100, Chris Wilson wrote:
> > Quoting Daniel Vetter (2018-05-03 15:25:52)
> > > Almost everyone uses dma_fence_default_wait.
> > > 
> > > v2: Also remove the BUG_ON(!ops->wait) (Chris).
> > 
> > I just don't get the rationale for implicit over explicit.
> 
> Closer approximation of dwim semantics. There's been tons of patch series
> all over drm and related places to get there, once we have a big pile of
> implementations and know what the dwim semantics should be. Individually
> they're all not much, in aggregate they substantially simplify simple
> drivers.

I also think clearer separation between optional optimization hooks and
mandatory core parts is useful in itself.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch



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