_IOC_NRMASK        21 arch/alpha/include/uapi/asm/ioctl.h #define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
_IOC_NRMASK        24 arch/sparc/include/uapi/asm/ioctl.h #define _IOC_NRMASK      ((1 << _IOC_NRBITS)-1)
_IOC_NRMASK        39 include/uapi/asm-generic/ioctl.h #define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)