Messages in this thread | | | From | "Marciniszyn, Mike" <> | Subject | RE: [PATCH 23/26] ib: Convert qib_get_user_pages() to get_user_pages_unlocked() | Date | Fri, 4 Oct 2013 13:39:03 +0000 |
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> -----Original Message----- > From: Jan Kara [mailto:jack@suse.cz] > Sent: Wednesday, October 02, 2013 11:39 AM > To: Marciniszyn, Mike > Cc: Jan Kara; LKML; linux-mm@kvack.org; infinipath; Roland Dreier; linux- > rdma@vger.kernel.org > Subject: Re: [PATCH 23/26] ib: Convert qib_get_user_pages() to > get_user_pages_unlocked() > > On Wed 02-10-13 15:32:47, Marciniszyn, Mike wrote: > > > > The risk of GUP fast is the loss of the "force" arg on GUP fast, > > > > which I don't see as significant give our use case. > > > Yes. I was discussing with Roland some time ago whether the force > > > argument is needed and he said it is. So I kept the arguments of > > > get_user_pages() intact and just simplified the locking... > > > > The PSM side of the code is a more traditional use of GUP (like direct > > I/O), so I think it is a different use case than the locking for IB > > memory regions. > Ah, I see. Whatever suits you best. I don't really care as long as > get_user_pages() locking doesn't leak into IB drivers :) > > Honza > -- > Jan Kara <jack@suse.cz> > SUSE Labs, CR
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