_IOC_TYPEMASK      22 arch/alpha/include/uapi/asm/ioctl.h #define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
_IOC_TYPEMASK      25 arch/sparc/include/uapi/asm/ioctl.h #define _IOC_TYPEMASK    ((1 << _IOC_TYPEBITS)-1)
_IOC_TYPEMASK      40 include/uapi/asm-generic/ioctl.h #define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)