linux-kernel - RE: [PATCH 23/26] ib: Convert qib_get_user_pages() to get_user_pages

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Date:	Fri, 4 Oct 2013 13:46:57 +0000
From:	"Marciniszyn, Mike" <mike.marciniszyn@...el.com>
To:	Jan Kara <jack@...e.cz>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	infinipath <infinipath@...el.com>,
	Roland Dreier <roland@...nel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH 23/26] ib: Convert qib_get_user_pages() to
 get_user_pages_unlocked()

Inadvertent send!

Mike

> -----Original Message-----
> From: Marciniszyn, Mike
> Sent: Friday, October 04, 2013 9:39 AM
> To: Jan Kara
> Cc: LKML; linux-mm@...ck.org; infinipath; Roland Dreier; linux-
> rdma@...r.kernel.org
> Subject: RE: [PATCH 23/26] ib: Convert qib_get_user_pages() to
> get_user_pages_unlocked()
> 
> 
> 
> > -----Original Message-----
> > From: Jan Kara [mailto:jack@...e.cz]
> > Sent: Wednesday, October 02, 2013 11:39 AM
> > To: Marciniszyn, Mike
> > Cc: Jan Kara; LKML; linux-mm@...ck.org; infinipath; Roland Dreier;
> > linux- rdma@...r.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@...e.cz>
> > SUSE Labs, CR
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