Re: [RFC PATCH 2/2] mm/gup: introduce vaddr_pin_pages_remote()

From: Jason Gunthorpe
Date: Fri Aug 16 2019 - 12:31:24 EST

On Fri, Aug 16, 2019 at 06:13:55PM +0200, Jan Kara wrote:

> > For 3 we do not need to take a reference at all :) So just forget about 3
> > it does not exist. For 3 the reference is the reference the CPU page table
> > has on the page and that's it. GUP is no longer involve in ODP or anything
> > like that.
> Yes, I understand. But the fact is that GUP calls are currently still there
> e.g. in ODP code. If you can make the code work without taking a page
> reference at all, I'm only happy :)

We are working on it :)