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 18:36:18 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Alexander Holler <holler@...oftware.de>,
	linux-usb@...r.kernel.org, gregkh@...e.de,
	lkml <linux-kernel@...r.kernel.org>, Rabin Vincent <rabin@....in>
Subject: Re: [PATCH] USB: ehci: use packed,aligned(4) instead of removing the
 packed attribute

On Mon, 20 Jun 2011, Alan Stern wrote:

> On Mon, 20 Jun 2011, Nicolas Pitre wrote:
> 
> > > As far as I can tell, the other structures in ehci.h have 
> > > ((aligned(32)) simply in order to save space, since there can be large 
> > > numbers of these structures allocated.
> > 
> > How can increasing the alignment to 32 bytes save space?
> 
> No, no -- the alignment is _decreased_ to 32 bits.  Without the 
> attribute the alignment would have been 64 bits.

The aligned attribute requires a byte value not a bit value.
Maybe what you meant is ((aligned(4)) ?


Nicolas
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