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Subject: Re: [PATCH v2 05/18] mm/gup: introduce pin_user_pages*() and FOLL_PIN
To: Jason Gunthorpe <jgg@ziepe.ca>
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From: John Hubbard <jhubbard@nvidia.com>
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On 11/4/19 12:31 PM, Jason Gunthorpe wrote:
> On Mon, Nov 04, 2019 at 12:09:05PM -0800, John Hubbard wrote:
> 
>> Note for Jason: the (a) or (b) items are talking about the vfio case, which is
>> one of the two call sites that now use pin_longterm_pages_remote(), and the
>> other one is infiniband:
>>
>> drivers/infiniband/core/umem_odp.c:646:         npages = pin_longterm_pages_remote(owning_process, owning_mm,
> 
> This is a mistake, it is not a longterm pin and does not need FOLL_PIN
> semantics

OK! So it really just wants to be get_user_pages_remote() / put_page()? I'll
change it back to that.

> 
>> Jason should weigh in on how he wants this to go, with respect to branching
>> and merging, since it sounds like that will conflict with the hmm branch 
> 
> I think since you don't need to change this site things should be
> fine?
> 

Right. 


thanks,

John Hubbard
NVIDIA