netdev - Re: [PATCH net-2.6.25 0/4] Convert IP4 address class macros to inline functions

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Date:	Mon, 19 Nov 2007 23:18:44 -0800
From:	Joe Perches <joe@...ches.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	James Morris <jmorris@...ei.org>,
	Patrick McHardy <kaber@...eworks.de>
Subject: Re: [PATCH net-2.6.25 0/4] Convert IP4 address class macros to
	inline functions

On Tue, 2007-11-20 at 16:06 +0900, Simon Horman wrote:
> On Mon, Nov 19, 2007 at 10:40:12PM -0800, Joe Perches wrote:
> > Change LOOPBACK MULTICAST LOCAL_MCAST BADCLASS and ZERONET
> > macros to inline functions ipv4_is_<type>(__be32 addr)
> > Adds some type safety and arguably some readability
> > No change in compiled image size
> > Signed-off-by: Joe Perches <joe@...ches.com>
> I can understand the motivation for moving the functionality into
> inline functions in order to get some type safety. But what is
> the motivation for changing all the macro calls to function calls,
> when you have set up the marcos to call the appropriate functions?

It's just a sequence that allows the kernel to compile.

I expect to remove the macros when the other callsites,
drivers/infiniband and drivers/parisc, are converted.

> Surely if you want to do that you should just ditch the marcos all
> together. Perhaps I am missing a patch?

That's what I'd like to do but in sequence.

David Miller can reasonably accept the net changes, but
I'm not too sure he can accept the drivers changes.

If/when this change is accepted and patches for drivers are
accepted, I'll submit a patch to remove the macros.

> Also, as the function names are longer than the macro name
> you are creating lines that are > 80 columns wide that used
> not to be in that state. For my eyes that reduced readability
> (substantially).

David? You want a patch for that too?

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