GET_LOW_SLICE_INDEX    8 arch/powerpc/include/asm/book3s/64/slice.h #define GET_LOW_SLICE_INDEX(addr)	((addr) >> SLICE_LOW_SHIFT)
GET_LOW_SLICE_INDEX   10 arch/powerpc/include/asm/nohash/32/slice.h #define GET_LOW_SLICE_INDEX(addr)	((addr) >> SLICE_LOW_SHIFT)