powerpc: Fix pfn_valid() when memory starts at a non-zero address
max_mapnr is a pfn, not an index innto mem_map[]. So don't add ARCH_PFN_OFFSET a second time. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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