Re: [PATCH v15 01/14] mm/page_ext: Export lookup_page_ext() to GPL modules

[Christoph Hellwig]

On Mon, Jun 08, 2020 at 01:53:23PM +0200, David Hildenbrand wrote:
> > @@ -131,6 +131,7 @@ struct page_ext *lookup_page_ext(const struct page *page)
> >  					MAX_ORDER_NR_PAGES);
> >  	return get_entry(base, index);
> >  }
> > +EXPORT_SYMBOL_GPL(lookup_page_ext);
> >  
> >  static int __init alloc_node_page_ext(int nid)
> >  {
> > 
> 
> I've been told to always smuggle new EXPORTs into the patch that
> actually needs it (and cc relevant people on that patch instead).

A separate patch for anything remotely controversial really helps it
to stick out, so I think keeping it separate is a very good practice.