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Message-Id: <201106202209.35152.arnd@arndb.de> Date: Mon, 20 Jun 2011 22:09:34 +0200 From: Arnd Bergmann <arnd@...db.de> To: linux-arm-kernel@...ts.infradead.org Cc: Alan Stern <stern@...land.harvard.edu>, Alexander Holler <holler@...oftware.de>, gregkh@...e.de, Nicolas Pitre <nico@...xnic.net>, linux-usb@...r.kernel.org, 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 Monday 20 June 2011 20:39:02 Alan Stern wrote: > 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? No. When the structure is marked packed, it's broken because it relies on undefined behavior. If it's not packed, there is no problem. > > 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? Only on compilers that are not able to build Linux kernels anyway. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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