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Message-ID: <adavdt3t0wf.fsf@cisco.com>
Date:	Mon, 29 Dec 2008 08:13:36 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Aleksey Senin <alekseys@...taire.com>
Cc:	"general\@lists.openfabrics.org" <general@...ts.openfabrics.org>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Linus <torvalds@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: linux-next: origin tree build failure

 > After another investigation of this problem, I think that proposed
 > solution is #ifdef as good for a first stage. IPv6 support is mandatory
 > when we are talking about running linux in some organization. But, of
 > course, the way how it implemented in IB stack should be changed. So on
 > the second stage, I'd like drop out these "defines" and at the time of
 > module initialization obtain addresses of IPv6 functions and in the case
 > if they are present at the runtime, call them. It should be nice
 > solution for RMDA_CM and IPoIB modules.

I don't think this second stage sounds like a good idea.  Suppose
someone loads the RDMA CM first, so it doesn't find the ipv6 functions,
and then later loads and configures ipv6.  You'll end up in a situation
where trying to make an IPv6 connection fails spuriously.  (And just the
ugliness of looking up function pointers isn't very nice either)

 - R.
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