Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759355AbaJ3MSV (ORCPT ); Thu, 30 Oct 2014 08:18:21 -0400 Received: from mta-out1.inet.fi ([62.71.2.194]:44085 "EHLO jenni2.inet.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758889AbaJ3MSU (ORCPT ); Thu, 30 Oct 2014 08:18:20 -0400 Date: Thu, 30 Oct 2014 14:17:37 +0200 From: "Kirill A. Shutemov" To: Andrea Arcangeli Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michel Lespinasse , Andrew Jones , Hugh Dickins , Mel Gorman , Andres Lagar-Cavilla , Minchan Kim , KOSAKI Motohiro , "\\\"Dr. David Alan Gilbert\\\"" , Peter Feiner , Peter Zijlstra , Benjamin Herrenschmidt , James Bottomley , David Miller , Steve Capper , Johannes Weiner Subject: Re: [PATCH 2/5] mm: gup: add __get_user_pages_unlocked to customize gup_flags Message-ID: <20141030121737.GB31134@node.dhcp.inet.fi> References: <1414600520-7664-1-git-send-email-aarcange@redhat.com> <1414600520-7664-3-git-send-email-aarcange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1414600520-7664-3-git-send-email-aarcange@redhat.com> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 29, 2014 at 05:35:17PM +0100, Andrea Arcangeli wrote: > Some caller (like KVM) may want to set the gup_flags like > FOLL_HWPOSION to get a proper -EHWPOSION retval instead of -EFAULT to > take a more appropriate action if get_user_pages runs into a memory > failure. > > Signed-off-by: Andrea Arcangeli > --- > include/linux/mm.h | 4 ++++ > mm/gup.c | 44 ++++++++++++++++++++++++++++++++------------ > mm/nommu.c | 16 +++++++++++++--- > 3 files changed, 49 insertions(+), 15 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 99831d9..9a5ada3 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -1222,6 +1222,10 @@ long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, > unsigned long start, unsigned long nr_pages, > int write, int force, struct page **pages, > int *locked); > +long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, > + unsigned long start, unsigned long nr_pages, > + int write, int force, struct page **pages, > + unsigned int gup_flags); > long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, > unsigned long start, unsigned long nr_pages, > int write, int force, struct page **pages); > diff --git a/mm/gup.c b/mm/gup.c > index a8521f1..01534ff 100644 > --- a/mm/gup.c > +++ b/mm/gup.c > @@ -591,9 +591,9 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk, > int write, int force, > struct page **pages, > struct vm_area_struct **vmas, > - int *locked, bool notify_drop) > + int *locked, bool notify_drop, > + unsigned int flags) Argument list getting too long. Should we consider packing them into a struct? -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/