_IOC_SIZEMASK      23 arch/alpha/include/uapi/asm/ioctl.h #define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
_IOC_SIZEMASK      26 arch/sparc/include/uapi/asm/ioctl.h #define _IOC_SIZEMASK    ((1 << _IOC_SIZEBITS)-1)
_IOC_SIZEMASK      41 include/uapi/asm-generic/ioctl.h #define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)