/proc/profile broken on UP machines in 2.6.29-rc3

[Lennert Buytenhek]

I'm about 130k emails behind on my linux-kernel@ subscription, so I'm
not entirely sure whether this has been reported, but it seems that
profiling is broken on !CONFIG_SMP builds in 2.6.29-rc3.

It appears that since this commit:

	commit c309b917cab55799ea489d7b5f1b77025d9f8462
	Author: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
	Date:   Thu Jan 1 10:12:27 2009 +1030

	    cpumask: convert kernel/profile.c

there's no longer anything that sets any bits in prof_cpu_mask on
UP systems at all (the default was to assign CPU_MASK_ALL, and
profile_cpu_callback() which clears/sets bits at run time is only
built and registered on SMP builds), so the cpumask_test_cpu()
test in profile_tick() always fails, and no samples are ever counted.
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