linux-kernel - Re: [patch 1/4] Add routine for generating an ID for kernel pointer

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Message-ID: <20111228170521.GT27266@moon>
Date:	Wed, 28 Dec 2011 21:05:21 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 1/4] Add routine for generating an ID for kernel pointer

On Wed, Dec 28, 2011 at 04:51:14PM +0000, Alan Cox wrote:
> > +	  be used for anything but the "sameness" test. Besides, the IDs are
> > +	  dynamic and valid only while object is alive, once it get freed or
> 
> Please explain your locking model which ensures a false sameness cannot
> occur due to object reuse as you do the comparison and scan.
> 

It can happen in case of object re-allocated from slab. But in case
of two living pids it's impossible to get same pointers for different
objects. Or I misunderstood the question, Alan? It's up to application
to not compare objects from dead tasks.

	Cyrill
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