On Thu, Apr 15, 2021 at 04:24:15PM -0400, Konrad Rzeszutek Wilk wrote:

So you are exposing these two:
 EXPORT_SYMBOL_GPL(get_vm_area);
 EXPORT_SYMBOL_GPL(ioremap_page_range);

But if you used vmap wouldn't you get the same thing for free?

Yes, this needs to go into some vmap version, preferably reusing the
existing code in kernel/dma/remap.c.

Exporting get_vm_area is a complete dealbreaker and not going to happen.
We worked hard on not exposing it to modules.