netdev - Re: [PATCH 4/11] use ether_addr_equal

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Message-ID: <1388445422.26796.38.camel@joe-AO722>
Date:	Mon, 30 Dec 2013 15:17:02 -0800
From:	Joe Perches <joe@...ches.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Julia Lawall <julia.lawall@...6.fr>,
	kernel-janitors@...r.kernel.org,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/11]  use ether_addr_equal_64bits

On Tue, 2013-12-31 at 00:13 +0100, Johannes Berg wrote:
> On Mon, 2013-12-30 at 19:57 -0200, Henrique de Moraes Holschuh wrote:
> > On Mon, 30 Dec 2013, Johannes Berg wrote:
> > > On Mon, 2013-12-30 at 20:58 +0100, Julia Lawall wrote:
> > > > > Is there any way we could catch (sparse, or some other script?) that
> > > > > struct reorganising won't break the condition needed ("within a
> > > > > structure that contains at least two more bytes")?
> > > > 
> > > > What kind of reorganizing could happen?  Do you mean that the programmer 
> > > > might do at some time in the future, or something the compiler might do?
> > > 
> > > I'm just thinking of a programmer, e.g. changing a struct like this:
> > > 
> > >  struct foo {
> > >    u8 addr[ETH_ALEN];
> > > -  u16 dummy;
> > >  };

I don't know of a way to catch that.
Anyone else?

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