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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: ppp_generic - use idr technique instead of
 cardmaps
Date: Wed, 17 Dec 2008 17:41:02 -0800 (PST)
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From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 17 Dec 2008 17:16:25 -0800

> What is the locking for the IDR tree?  all_ppp_mutex?

Yes.