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:

quoted

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.