cure the lockup that some people have seen.

The shmfs cleanup should be unnoticeable except to users who use SAP with
huge shared memory segments, where Christoph Rohlands work not only
makes the code much more readable, it should also make it dependable..

- Christian Jullien: smc9194: proper dev_kfree_skb_irq
- Cort Dougan: new-style PowerPC Makefiles
- Andrew Morton, Petr Vandrovec: fix run_task_queue
- Christoph Rohland: shmfs for shared memory handling