linux-kernel - Re: [PATCH] USB: ehci: use packed, aligned(4) instead of removing the packed attribute

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Date:	Mon, 20 Jun 2011 17:03:17 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, gregkh@...e.de,
	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	Rabin Vincent <rabin@....in>,
	Alan Stern <stern@...land.harvard.edu>,
	Alexander Holler <holler@...oftware.de>
Subject: Re: [PATCH] USB: ehci: use packed,
 aligned(4) instead of removing the packed attribute

On Mon, 20 Jun 2011, Arnd Bergmann wrote:

> On Monday 20 June 2011 22:28:49 Nicolas Pitre wrote:
> > On Mon, 20 Jun 2011, Arnd Bergmann wrote:
> > 
> > > On Monday 20 June 2011 19:39:34 Alexander Holler wrote:
> > > > That packed without an additional aligned() caused errors on ARM with 
> > > > gcc 4.6 is another problem which got (currently) fixed by removing packed.
> > > 
> > > Packed caused errors because it is *wrong*. The code as it was used undefined
> > > behavior in the language.
> > 
> > I wouldn't call this issue as such, but this is a Red herring.
> > 
> > Could you please provide a pointer to the structure definition so a 
> > second opinion to the usefulness of __packed there could be provided?  
> 
> The structures in question are ehci_caps, ehci_regs and ehci_dbg_port.

OK.  If anyone was still entertaining any doubts, those structures do 
not require any packed attribute what so ever.

> The patch that remove the __packed attribute was 139540170 "USB: ehci:
> remove structure packing from ehci_def".

Too late for this, but for the record:

Reviewed-by: Nicolas Pitre <nicolas.pitre@...aro.org>

Hopefully this thread still gathered enough wisdom about proper usage of 
the packed and aligned attributes into the list archive.


Nicolas
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