mm/memory_hotplug.c: use PFN_DOWN()
Replace ((x) >> PAGE_SHIFT) with the pfn macro. Signed-off-by: NFabian Frederick <fabf@skynet.be> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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