netdev - Re: [RFC] ipv6: Change %pI6 format to output compacted addresses?

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Date:	Thu, 13 Aug 2009 13:34:35 -0700
From:	Joe Perches <joe@...ches.com>
To:	Brian Haley <brian.haley@...com>
Cc:	Jens Rosenboom <jens@...one.net>,
	Linux Network Developers <netdev@...r.kernel.org>,
	Chuck Lever <chuck.lever@...cle.com>
Subject: Re: [RFC] ipv6: Change %pI6 format to output compacted addresses?

On Thu, 2009-08-13 at 16:24 -0400, Brian Haley wrote:
> Is your arch "um"?  Seems like those are only defined there, I'm building
> a straight x86 kernel.

Nope.

I did make allyesconfig ; make lib/vsprintf.o lib ctype.o
allnoconfig works though.

> This core dumps when running "test", I'm still trying to track down why.

missing return on ip_addr_string

> I think we're thinking too hard about this, I would think we'd always
> want to print the shortened IPv6 address in debugging messages with %pI6.

True, but you can't tell in sprintf as it's used in seq.

for instance:
net/sunrpc/svcauth_unix.c:		seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);

> The %pi6 places need to stay since they're an API to userspace.  I don't
> think we need the extra "c" and "c4" support.

I'm pretty sure it can't change and a new form is needed
so %pi6c should be OK.

I'd rather not use another %p<foo> letter.

> One comment on a quick scan of the code:
> ip6_addr[8 * 5] is fine here, we won't ever have all eight plus an IPv4 address.

I'm fixing it up and will resubmit something working in a little while.

cheers, Joe

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