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Date: Tue, 22 Apr 2008 16:13:20 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: Andrea Arcangeli <andrea@qumranet.com>
cc: Nick Piggin <npiggin@suse.de>, Jack Steiner <steiner@sgi.com>,
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Subject: Re: [PATCH 03 of 12] get_task_mm should not succeed if mmput() is
 running and has reduced
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On Wed, 23 Apr 2008, Andrea Arcangeli wrote:

> On Tue, Apr 22, 2008 at 01:23:16PM -0700, Christoph Lameter wrote:
> > Missing signoff by you.
> 
> I thought I had to signoff if I conributed with anything that could
> resemble copyright? Given I only merged that patch, I can add an
> Acked-by if you like, but merging this in my patchset was already an
> implicit ack ;-).

No you have to include a signoff if the patch goes through your custody 
chain. This one did.

Also add a 

From: Christoph Lameter <clameter@sgi.com>

somewhere if you want to signify that the patch came from me.