_SHM_ID_BITS       25 include/asm-m68k/shm.h #define SHM_ID_MASK	((1<<_SHM_ID_BITS)-1)
_SHM_ID_BITS       27 include/asm-m68k/shm.h #define SHM_IDX_SHIFT	(SHM_ID_SHIFT+_SHM_ID_BITS)