linux-kernel - Re: [PATCH 2/5] mm: gup: add __get_user_pages_unlocked to customize gup

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Message-ID: <20141031165836.GW23531@worktop.programming.kicks-ass.net>
Date:	Fri, 31 Oct 2014 17:58:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michel Lespinasse <walken@...gle.com>,
	Andrew Jones <drjones@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	"\\\"Dr. David Alan Gilbert\\\"" <dgilbert@...hat.com>,
	Peter Feiner <pfeiner@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	David Miller <davem@...emloft.net>,
	Steve Capper <steve.capper@...aro.org>,
	Johannes Weiner <jweiner@...hat.com>
Subject: Re: [PATCH 2/5] mm: gup: add __get_user_pages_unlocked to customize
 gup_flags

On Thu, Oct 30, 2014 at 06:43:09PM +0100, Andrea Arcangeli wrote:
> On Thu, Oct 30, 2014 at 02:17:37PM +0200, Kirill A. Shutemov wrote:
> > On Wed, Oct 29, 2014 at 05:35:17PM +0100, Andrea Arcangeli wrote:
> > > 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?
> 
> It's __always_inline, so it's certainly not a runtime concern. The
> whole point of using __always_inline is to optimize away certain
> branches at build time.

Its also exported:

+EXPORT_SYMBOL(__get_user_pages_unlocked);

Note that __always_inline is only valid within the same translation unit
(unless you get LTO working).
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