netdev - RE: Re: [PATCH 9/9] batman-adv: Use packing of 2 for all headers before an ethernet header

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Date:	Thu, 22 Nov 2012 08:12:38 +0000
From:	Kevin Curtis <Kevin.Curtis@...site.com>
To:	Sven Eckelmann <sven@...fation.org>,
	David Miller <davem@...emloft.net>
CC:	"ordex@...istici.org" <ordex@...istici.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"b.a.t.m.a.n@...ts.open-mesh.org" <b.a.t.m.a.n@...ts.open-mesh.org>,
	"lindner_marek@...oo.de" <lindner_marek@...oo.de>,
	"linux-driver@...gic.com" <linux-driver@...gic.com>,
	"ron.mercer@...gic.com" <ron.mercer@...gic.com>,
	"jitendra.kalsaria@...gic.com" <jitendra.kalsaria@...gic.com>,
	"rmody@...cade.com" <rmody@...cade.com>,
	"andy@...yhouse.net" <andy@...yhouse.net>,
	"fubar@...ibm.com" <fubar@...ibm.com>
Subject: RE: Re: [PATCH 9/9] batman-adv: Use packing of 2 for all headers
 before an ethernet header

>> Agree. But we should get this message also to the other guys

What message would this be?
Are you advocating a different use of #pragma pack()?


Kevin Curtis
Linux Development
FarSite Communications Ltd http://www.farsite.com
Winner of The Queen's Award for Enterprise 2009
tel:  +44 1256 330461
fax:  +44 1256 854931



-----Original Message-----
From: Sven Eckelmann [mailto:sven@...fation.org] 
Sent: 21 November 2012 18:20
To: David Miller
Cc: ordex@...istici.org; netdev@...r.kernel.org; b.a.t.m.a.n@...ts.open-mesh.org; lindner_marek@...oo.de; Kevin Curtis; linux-driver@...gic.com; ron.mercer@...gic.com; jitendra.kalsaria@...gic.com; rmody@...cade.com; andy@...yhouse.net; fubar@...ibm.com
Subject: Re: Re: [PATCH 9/9] batman-adv: Use packing of 2 for all headers before an ethernet header

On Wednesday 21 November 2012 12:57:59 David Miller wrote:
> From: Antonio Quartulli <ordex@...istici.org>
> Date: Wed, 21 Nov 2012 13:11:59 +0100
> 
> > +#pragma pack(2)
> 
>  ...
> 
> > -} __packed;
> 
> The __packed attribute is an abstraction of the actual syntax the 
> compiler uses, if it is supported at all.
> 
> Therefore, you can't just unconditionally use the #pragma, and you 
> would need to use some kind of similar compiler abstraction for it.
> 
> But to be honest this is really ugly and for very little, if any, 
> gain.

Agree. But we should get this message also to the other guys

$ git grep pragma -- drivers/net
drivers/net/bonding/bond_3ad.h:#pragma pack(1) drivers/net/bonding/bond_3ad.h:#pragma pack() drivers/net/bonding/bond_3ad.h:#pragma pack(8) drivers/net/bonding/bond_3ad.h:#pragma pack() drivers/net/bonding/bond_alb.c:#pragma pack(1) drivers/net/bonding/bond_alb.c:#pragma pack() drivers/net/ethernet/brocade/bna/bfa_defs.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/bfa_defs.h:#pragma pack() drivers/net/ethernet/brocade/bna/bfa_defs_cna.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/bfa_defs_cna.h:#pragma pack() drivers/net/ethernet/brocade/bna/bfa_defs_mfg_comm.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/bfa_defs_mfg_comm.h:#pragma pack() drivers/net/ethernet/brocade/bna/bfi.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/bfi.h:#pragma pack() drivers/net/ethernet/brocade/bna/bfi_cna.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/bfi_cna.h:#pragma pack() drivers/net/ethernet/brocade/bna/bfi_enet.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/bfi_enet.h:#pragma pack() drivers/net/ethernet/brocade/bna/cna.h:#pragma pack(1) drivers/net/ethernet/brocade/bna/cna.h:#pragma pack() drivers/net/ethernet/qlogic/qla3xxx.h:#pragma pack(1) drivers/net/ethernet/qlogic/qla3xxx.h:#pragma pack() drivers/net/wan/farsync.c:#pragma pack(1) drivers/net/wan/farsync.c:#pragma pack()

Kind regards,
	Sven
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