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

[Christoph Hellwig]

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.

Even if you did, internals like this should always be EXPORT_SYMBOL_GPL.