Symbol: umtx_pi_drop
sys/compat/linux/linux_futex.c
590
error = umtx_pi_drop(td, &key, rb, &count);
sys/kern/kern_umtx.c
2488
error = umtx_pi_drop(td, &key, rb, &count);
sys/sys/umtxvar.h
227
int umtx_pi_drop(struct thread *, struct umtx_key *, bool, int *);