Re: [PATCH] USB: ehci: use packed,aligned(4) instead of removingthe packed attribute

From: Alan Stern
Date: Thu Jun 16 2011 - 16:30:34 EST

On Thu, 16 Jun 2011, Alexander Holler wrote:

> > Hmmm. I won't say that ((packed,aligned(4))) is wrong. But it's not
> > clearly necessary either.
> Maybe I should have added a "cosmetic:" in front of the subject of the
> patch. ;)
> Using packed doesn't seem to be necessary (at least not with those
> versions of gcc I'm using here), I've tried both versions (on arm,
> without packed and with packed, aligned(4)) and both are working. I've
> only posted the patch because I found the usage of packed, aligned(4)
> much clearer than without packed. And It might help avoiding such
> discussions like this with people like me who aren't that deep involved
> in gcc-specific implementation details. ;)
> Anyway, feel free to nack that patch. I don't really care and just
> thought I should post it (e.g. as an alternative to removing that packed).

There are other structures that need to avoid padding but aren't marked
((packed)), such as ehci_qtd and ehci_qh_hw in drivers/usb/host/ehci.h.
I don't see why those in ehci_def.h should get special treatment.

Alan Stern

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