I noticed that the tasks queues still rely on the global tqueue_lock
spinlock, instead of a per-taskqueue lock.

The patch is virtually transparent for task queue users: all users
except ieee1394 use DECLARE_TASK_QUEUE.

I admit that the tqueue_lock isn't that often used (numbers from sgi's
lockstat)

* 10000 users/min during 'find / -xdev -uid 4711' (1.2% of all spinlock
calls)
* 60000 users/min during 'dd if=/dev/hda of=/dev/null' (~1.1% of all
spinlock calls).


--
	Manfred