Re: [RFC][PATCH 1/2] mm: cma: Export cma symbols for cma heap as a module

[John Stultz]

On Mon, Oct 28, 2019 at 11:39 AM John Stultz <john.stultz@xxxxxxxxxx> wrote:
> On Mon, Oct 28, 2019 at 12:46 AM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> >
> > On Fri, Oct 25, 2019 at 11:48:33PM +0000, John Stultz wrote:
> > >  struct cma *dma_contiguous_default_area;
> > > +EXPORT_SYMBOL(dma_contiguous_default_area);
> >
> > Please CC the dma maintainer.  And no, you have no business using this.
>
> Sure thing. And I'll look again to see why I was needing to pull that
> one in to get it to build.

Ah. So looking a bit closer, I'm needing this due to my using
dev_get_cma_area()  to get the default cma area for the dmabuf
cma_heap.

Do you have a suggestion for how to get a reference to the default CMA
area without exporting dma_contiguous_default_area? Would it be
preferred to move dev_get_cma_area() into the .c file and
EXPORT_SYMBOL_GPL that function?

thanks
-john