Symbol: FUTEX_OP_CMPARG_MASK
sys/kern/sys_futex.c
1544
int cmparg = futex_opcmp_arg(__SHIFTOUT(opcmp, FUTEX_OP_CMPARG_MASK));
sys/sys/futex.h
104
__SHIFTIN((cmparg) & 0xfff, FUTEX_OP_CMPARG_MASK))