netdev - Re: [Bugme-new] [Bug 8635] New: EV6 version of csum_ipv6

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Date:	Sat, 16 Jun 2007 20:44:25 +0400
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, Richard Henderson <rth@...ddle.net>,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...nel-bugs.osdl.org>
Subject: Re: [Bugme-new] [Bug 8635] New: EV6 version of csum_ipv6_magic causing unaligned access errors

On Sat, Jun 16, 2007 at 12:06:20AM -0700, Andrew Morton wrote:
> > kernel unaligned acc    : 34 (pc=fffffc00004bbf58,va=fffffc000394811c)
> > 
> > fffffc00004bbdb0 T __copy_user
> > fffffc00004bbf50 T csum_ipv6_magic
> > fffffc00004bc020 T memchr
> > 
> > Seems to be associated w/ arch/alpha/lib/ev6-csum_ipv6_magic.S
> > 
> > Steps to reproduce:
> > 
> > Use IPv6 on an Alpha EV6 or higher CPU.
> > 
> 
> I assume that networking passed the arch an unaligned pointer and the arch
> didn't expect that.
> 
> I further assume that this is an alpha shortcoming, and that this behaviour
> of networking is expected?

Indeed, it's alpha bug. The struct in6_addr passed to this routine has
4 byte alignment, so we cannot use normal 64 bit loads.

Hopefully I'll have a fix shortly. BTW, it's not only ev6, ev5 variant
is broken as well.

Ivan.
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