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

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Message-ID: <20131002153842.GD32181@quack.suse.cz>
Date:	Wed, 2 Oct 2013 17:38:42 +0200
From:	Jan Kara <jack@...e.cz>
To:	"Marciniszyn, Mike" <mike.marciniszyn@...el.com>
Cc:	Jan Kara <jack@...e.cz>, 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()

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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