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

[Jason Gunthorpe]

On Thu, Aug 15, 2019 at 03:35:10PM +0200, Jan Kara wrote:

> > 3) ODP case - GUP references to pages serving as DMA buffers, MMU notifiers
> >    used to synchronize with page_mkclean() and munmap() => normal page
> >    references are fine.
> 
> I want to add that I'd like to convert users in cases 1) and 2) from using
> GUP to using differently named function. Users in case 3) can stay as they
> are for now although ultimately I'd like to denote such use cases in a
> special way as well...

3) users also want a special function and path, right now it is called
hmm_range_fault() but perhaps it would be good to harmonize it more
with the GUP infrastructure?

I'm not quite sure what the best plan for that is yet.

Jason