linux-kernel - Re: [PATCH 4/11] use ether_addr_equal

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Message-ID: <1389003467.5891.5.camel@jlt4.sipsolutions.net>
Date:	Mon, 06 Jan 2014 11:17:47 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Ben Greear <greearb@...delatech.com>,
	Joe Perches <joe@...ches.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	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 Mon, 2014-01-06 at 10:09 +0100, Julia Lawall wrote:

> > BUILD_BUG_ON(sizeof(struct foo) - offsetof(struct foo, addr) < 8);
> >
> > with the user(s?) and that should catch the scenario I was worrying
> > about?
> 
> OK, thanks.  That is what I had in mind.  But I was hoping to be able to
> put it with the structure.  

Right - you might be able to do that with BUILD_BUG_ON_ZERO() as you
pointed out, I haven't looked at these macros in a while.

> Perhaps there is a way to make a macro that
> expands to a dummy function that contains the BUILD_BUG_ON?  But I guess
> that would waste space?
> 
> I think that 8 should be 16?

No, that should be ETH_ALEN+2 really, I guess - it's not taking into
account the size of the address member itself at all.

johannes


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