VPB_SHARERS_WORD
KASSERT((x & ~VPB_BIT_WAITERS) == VPB_SHARERS_WORD(1),
KASSERT((x & ~VPB_BIT_WAITERS) == VPB_SHARERS_WORD(1),
m->busy_lock = VPB_SHARERS_WORD(1);
busy_lock = VPB_SHARERS_WORD(1);
&x, VPB_SHARERS_WORD(1)))
#define VPB_UNBUSIED VPB_SHARERS_WORD(0)