[PATCH] sched.c neatening and fixes.
1) Fix the comments for the migration_thread. A while back Ingo agreed they were exactly wrong, IIRC. 8). 2) Changed spin_lock_irqsave to spin_lock_irq, since it's in a kernel thread. 3) Don't repeat if the task has moved off the original CPU, just finish. This is because we are simply trying to push the task off this CPU: if it's already moved, great. Currently we might theoretically move a task which is actually running on another CPU, which is v. bad. 4) Replace the __ffs(p->cpus_allowed) with any_online_cpu(), since that's what it's for, and __ffs() can give the wrong answer, eg. if there's no CPU 0. 5) Move the core functionality of migrate_task into a separate function, move_task_away, which I want for the hotplug CPU patch.
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