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If max_pfn is not initialized, the block layer may use wrong DMA masks. Replace open-coded shifts by PFN_DOWN(), and drop the "0 on coldfire" comment, as it is not even true on all Coldfires, let alone all m68knommu platforms. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Greg Ungerer <gerg@uclinux.org> Tested-By: Greg Ungerer <gerg@uclinux.org>