linux-kernel - Re: No more bits in vm_area_struct's vm

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Message-ID: <20090925210942.GB29634@8bytes.org>
Date:	Fri, 25 Sep 2009 23:09:42 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: No more bits in vm_area_struct's vm_flags.

On Fri, Sep 25, 2009 at 06:48:34PM +1000, Nigel Cunningham wrote:
> Hi.
> 
> KAMEZAWA Hiroyuki wrote:
> > On Fri, 25 Sep 2009 18:34:56 +1000
> > Nigel Cunningham <ncunningham@...a.org.au> wrote:
> > 
> >> Hi.
> >>
> >> KAMEZAWA Hiroyuki wrote:
> >>>> I have some code in TuxOnIce that needs a bit too (explicitly mark the
> >>>> VMA as needing to be atomically copied, for GEM objects), and am not
> >>>> sure what the canonical way to proceed is. Should a new unsigned long be
> >>>> added? The difficulty I see with that is that my flag was used in
> >>>> shmem_file_setup's flags parameter (drm_gem_object_alloc), so that
> >>>> function would need an extra parameter too..
> >>> Hmm, how about adding vma->vm_flags2 ?
> >> The difficulty there is that some functions pass these flags as arguments.
> >>
> > Ah yes. But I wonder some special flags, which is rarey used, can be moved
> > to vm_flags2...

But please don't call it vm_flags2. I think its better to partition the
existing flags by there purpose somehow hand give the flags fields
appropriate names which express that purpose.

	Joerg

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