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

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Message-ID: <Pine.LNX.4.44L0.1106201436430.2113-100000@iolanthe.rowland.org>
Date:	Mon, 20 Jun 2011 14:39:02 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Alexander Holler <holler@...oftware.de>
cc:	Nicolas Pitre <nico@...xnic.net>, Arnd Bergmann <arnd@...db.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<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, Alexander Holler wrote:

> I see it that way: packed is needed to be sure that at least for struct 
> ehci_regs there are no padding bytes inbetween the members.

But is it _really_ needed?

> It might 
> work without, but that depends on the compiler (-version, architecture, 
> whatever).

Have there _ever_ been _any_ combinations of compiler, version, 
architecture, whatever, that had unwanted padding bytes in this 
structure?

Alan Stern

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