ISA_IO_END        315 arch/powerpc/include/asm/book3s/64/pgtable.h #define  ISA_IO_END	(KERN_IO_START + 0x10000ul)
ISA_IO_END         52 arch/powerpc/include/asm/nohash/64/pgtable.h #define  ISA_IO_END	(KERN_IO_START + 0x10000ul)