From: James Bottomley <James.Bottomley@SteelEye.com>

Most is just simple fixes; however, the needless change from atomic to
non-atomic operations in smp_invalidate_interrupt() caused me a lot of
pain to track down since it introduced some very subtle bugs.

I've also taken phys_cpu_present_map out of smp.h.  Since it
physid_mask_t is defined in mpspec.h anyway, and contains a duplicate
definition, I don't believe it can hurt anything.