KERN_IO_START     288 arch/powerpc/include/asm/book3s/64/pgtable.h #define KERN_IO_START  __kernel_io_start
KERN_IO_START      49 arch/powerpc/include/asm/nohash/64/pgtable.h #define KERN_IO_START	(KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))