linux-kernel - Re: [sparc64] 2.6.18 unaligned acccess in ehci_hub

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Date:	Thu, 21 Sep 2006 13:51:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mikpe@...uu.se
Cc:	simoneau@....uri.edu, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [sparc64] 2.6.18 unaligned acccess in ehci_hub_control

From: Mikael Pettersson <mikpe@...uu.se>
Date: Thu, 21 Sep 2006 12:37:09 +0200

> I don't think it's harmless. My Ultra5 has an add-on PCI USB controller
> card (Belkin). A 2.6.18-rc kernel compiled with gcc-4.1.1 will throw a few
> unaligned accesses when I initialise USB by inserting a USB memory stick.
> Removing the memory stick then results in PCI errors and other breakage.
> 
> The same kernel compiled with gcc-3.4.6 has no problems at all, so I've
> been assuming it's a gcc-4 issue and not a kernel issue.

Compiled with gcc-4.0.x I get the same ehci_hub_control unaligned
accesses, and putting the correct {get,put}_unaligned() in that
function makes them go away.

It's a pure mystery if gcc-3.4.x somehow avoids those, as by the
way the code is written those unaligned accesses are to be expected.
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