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

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Message-ID: <4ABC83E2.7050300@crca.org.au>
Date:	Fri, 25 Sep 2009 18:48:34 +1000
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	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.

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...

Ah, of course. That makes sense.

Regards,

Nigel
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