Re: RFC: [2.6 patch] disallow modular IPv6
From: Adrian Bunk (bunk_at_fs.tum.de)
Date: 09/29/03
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Date: Mon, 29 Sep 2003 01:24:03 +0200 To: Arnaldo Carvalho de Melo <acme@conectiva.com.br>, netdev@oss.sgi.com, davem@redhat.com, pekkas@netcore.fi, lksctp-developers@lists.sourceforge.net, linux-kernel@vger.kernel.org
On Sun, Sep 28, 2003 at 08:18:42PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Sep 29, 2003 at 12:59:41AM +0200, Adrian Bunk escreveu:
> > It seems modular IPv6 doesn't work 100% reliable, e.g. after looking at
> > the code it doesn't seem to be a good idea to compile a kernel without
> > IPv6 support and later build and install IPv6 modules. Is there a great
> > need for modular IPv6 or is the patch below to disallow modular IPv6 OK?
>
> Please, don't... We're going in the all modules direction, not the other
> way around, distro (general purpose) kernels would get big bloat in the
> static kernel.
E.g. from include/net/tcp.h:
<-- snip -->
...
struct tcp_skb_cb {
union {
struct inet_skb_parm h4;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
struct inet6_skb_parm h6;
#endif
} header; /* For incoming frames */
...
<-- snip -->
This is broken since it's legal to compile a module much later than the
kernel.
If modular IPv6 is allowed, the #if has to be removed, and the struct
will be larger in the case IPv6 is never be used.
> - Arnaldo
cu
Adrian
--
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of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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