alignment exceptionhandler sleeps in invalid context

[Paul Mackerras]

Olaf Hering writes:

> I'm not sure where the bug is. Does it mean the network stack does
> something nasty, or is the exception handler itself broken? (probably the latter)
> This is 2.6.16.9 on a p270.

The alignment handler does a get_user to read the instruction.  I
suppose it will have to read the instruction directly if the exception
occurred in kernel mode.

Paul.