linux-kernel - Re: linux-next: origin tree build failure

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Date:	Sun, 28 Dec 2008 19:44:52 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	general@...ts.openfabrics.org,
	Aleksey Senin <alekseys@...taire.com>
Cc:	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

 > ERROR: ".ipv6_chk_addr" [drivers/infiniband/core/ib_addr.ko] undefined!
 > ERROR: ".ip6_route_output" [drivers/infiniband/core/ib_addr.ko] undefined!
 > 
 > Caused by commit 38617c64bf9a10bf20e41d95b69bb81e8560fe9d ("RDMA/addr:
 > Add support for translating IPv6 addresses").  This requires a dependency
 > on IPV6.

So how do we want to fix this?  (This question is mostly directed to the
IB guys)  One possibility is to make all this depend on IPV6 in Kconfig,
but I think we want the RDMA CM to be buildable/usable even if IPv6
isn't enabled.  A better option is to just put all the IPv6 related
stuff into

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)

and add a Kconfig dependency on (IPV6 || IPV6=n) as we did for IPoIB.

But then this leads to the behavior that loading the RDMA CM will cause
the ipv6 module to be loaded if IPV6=m in the kernel config, even if the
administrator doesn't want to enable IPv6, just as with IPoIB today.
And people already complain about that.

Anyone see a better solution (which we could use for IPoIB even)?

 - R.
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