netdev - Re: [Patch net-next 0/7] net: introduce generic type and helpers for IP address

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Date:	Mon, 22 Jul 2013 19:16:14 -0700
From:	Joe Perches <joe@...ches.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next 0/7] net: introduce generic type and helpers
 for IP address

On Tue, 2013-07-23 at 10:00 +0800, Cong Wang wrote:
> On Mon, 2013-07-22 at 13:44 -0700, Joe Perches wrote:
> > 
> > I see no reason why vsprint's support for
> > "struct sockaddr *" %pIS should be removed.
> > 
> > %pIS and %pIA can both exist.

> Because there is no need to keep both of them, struct sockaddr can be
> safely converted to union inet_addr.

That's a bit fragile.
The cost of keeping %pIS is pretty low.

Also, if there is ever a check for %p<type>,
then using:

	struct sockaddr *foo = bar;
	...
	snprintf(buf, len, "%pIA", foo)

would need foo to be cast first to union inet_addr *

	snprintf(buf, len, "%pIA", (union inet_addr *)foo);

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