netdev - Re: [PATCH v2 net-next] net: filter: export pkt_type

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Message-ID: <1409841709.23465.25.camel@localhost>
Date:	Thu, 04 Sep 2014 16:41:49 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Laight <David.Laight@...LAB.COM>,
	Denis Kirjanov <kirjanov@...il.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Denis Kirjanov <kda@...ux-powerpc.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Markos Chandras <markos.chandras@...tec.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH v2 net-next] net: filter: export pkt_type_offset() helper

On Do, 2014-09-04 at 07:35 -0700, Eric Dumazet wrote:
> On Thu, 2014-09-04 at 16:33 +0200, Hannes Frederic Sowa wrote:
> 
> > Which btw. also uses int, which might change alignment of structures.
> 
> You missed the point .
> 
> kmemcheck wants to make sure the whole word is set, or else you could
> get false positives.
> 
> kmemcheck needs are quite different.

Now that you said it, I understand. :)

You were right with the int vs. u8 thing all along. gcc aligns the
datatype on the next struct field and not on the whole field, as I
expected. So excuse my error above.

I think the latest proposals looks good?


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