linux-kernel - Re: [PATCH] net/9p: limit RDMA to INET

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Date:	Mon, 03 Nov 2008 12:52:50 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-next@...r.kernel.org,
	sfr <sfr@...b.auug.org.au>, rolandd@...co.com, ericvh@...il.com,
	akpm <akpm@...ux-foundation.org>, davem@...emloft.net,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net/9p: limit RDMA to INET

 > Make 9p's RDMA option depend on INET since it uses Infiniband rdma_*
 > functions and that code depends on INET.  Otherwise 9p can try to
 > use symbols which don't exist.
 > 
 > ERROR: "rdma_destroy_id" [net/9p/9pnet_rdma.ko] undefined!

Good catch.

 >  config NET_9P_RDMA
 > -	depends on NET_9P && INFINIBAND && EXPERIMENTAL
 > +	depends on INET && INFINIBAND && EXPERIMENTAL

I wonder if there's a way to make this depend on INFINIBAND_ADDR_TRANS
instead of INET, since that's the real dependency to get the rdma_*
symbols.  However INFINIBAND_ADDR_TRANS is a bool that gets set to y iff
INET and INFINIBAND are set, so it's not trivial to make a tristate
depend on it.

Maybe this patch is fine as it is, since the Kconfig dependencies are
unlikely to change anyway...

 - R.
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