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

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Message-Id: <20090924100518.78df6b93.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 24 Sep 2009 10:05:18 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Nigel Cunningham <ncunningham@...a.org.au>
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.

On Wed, 23 Sep 2009 14:15:18 +1000
Nigel Cunningham <ncunningham@...a.org.au> wrote:

> Hi all.
> 
> With the addition of the VM_MERGEABLE flag to vm_flags post-2.6.31, the
> last bit in vm_flags has been used.
> 

Wow...that's bad.



> 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 ?

Thanks,
-Kame


> Regards,
> 
> Nigel
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