Re: [RFC v5 08/11] [media] vb2: add videobuf2 dma-buf fence helpers

[Gustavo Padovan <gustavo@padovan.org>]

2017-11-17 Alexandre Courbot <acourbot@chromium.org>:

> On Friday, November 17, 2017 4:02:56 PM JST, Alexandre Courbot wrote:
> > On Thursday, November 16, 2017 2:10:54 AM JST, Gustavo Padovan wrote:
> > > From: Javier Martinez Canillas <javier@osg.samsung.com>
> > > 
> > > Add a videobuf2-fence.h header file that contains different helpers
> > > for DMA buffer sharing explicit fence support in videobuf2.
> > > 
> > > v2:	- use fence context provided by the caller in vb2_fence_alloc()
> > > 
> > > Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> ...
> > 
> > It is probably not a good idea to define that struct here since it will be
> > deduplicated for every source file that includes it.
> > 
> > Maybe change it to a simple declaration, and move the definition to
> > videobuf2-core.c or a dedicated videobuf2-fence.c file?
> > 
> > > +
> > > +static inline struct dma_fence *vb2_fence_alloc(u64 context)
> > > +{
> > > +	struct dma_fence *vb2_fence = kzalloc(sizeof(*vb2_fence), GFP_KERNEL);
> > > + ...
> > 
> > Not sure we gain a lot by having this function static inline, but your call.
> > 
> 
> Looking at the following patch, since it seems that this function is only to
> be
> called from vb2_setup_out_fence() anyway, you may as well make it static in
> videobuf2-core.c or even inline it in vb2_setup_out_fence() - it would only
> add a few extra lines to this function.

Okay, that makes sense, I'll will move everything to videobuf2-core.c