Re: [PATCH 3/3] mm/devmap: Remove pgmap accounting in the get_user_pages_fast() path

[Jason Gunthorpe]

On Thu, Mar 18, 2021 at 10:03:06AM -0700, Dan Williams wrote:
> Yes. I still need to answer the question of whether mapping
> invalidation triggers longterm pin holders to relinquish their hold,
> but that's a problem regardless of whether gup-fast is supported or
> not.

It does not, GUP users do not interact with addres_space or mmu
notifiers

Jason