Re: [RFC 00/17] DRM: fix struct sg_table nents vs. orig_nents misuse

[Daniel Vetter]

On Tue, Apr 28, 2020 at 04:02:57PM +0200, Christoph Hellwig wrote:
> On Tue, Apr 28, 2020 at 03:19:48PM +0200, Marek Szyprowski wrote:
> > 1. introduce a dma_{map,sync,unmap}_sgtable() wrappers, which will use
> >    a proper sg_table entries and call respective DMA-mapping functions
> >    and adapt current code to it
> 
> That sounds reasonable to me.  Those could be pretty trivial wrappers.
> 
> >
> > 
> > 2. rename nents and orig_nents to nr_pages, nr_dmas to clearly state
> >    which one refers to which part of the scatterlist; I'm open for
> >    other names for those entries
> 
> nr_cpu_ents and nr_dma_ents might be better names, but it still would be
> a whole lot of churn for little gain.  I think just good wrappers like
> suggested above might be more helpful.

I guess long-term we could aim for both? I.e. roll out better wrappers
first, once that's soaked through the tree, rename the last offenders.

Personally I like nr_cpu_ents and nr_dma_ents, that's about as clear as it
gets.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch