HAMMER2_XOP_FIFO_STALL
atomic_set_int(&fifo->flags, HAMMER2_XOP_FIFO_STALL);
atomic_clear_int(&fifo->flags, HAMMER2_XOP_FIFO_STALL);
if (fifo->flags & HAMMER2_XOP_FIFO_STALL) {
HAMMER2_XOP_FIFO_STALL);
if (fifo->flags & HAMMER2_XOP_FIFO_STALL) {
HAMMER2_XOP_FIFO_STALL);
atomic_set_int(&fifo->flags, HAMMER2_XOP_FIFO_STALL);
atomic_clear_int(&fifo->flags, HAMMER2_XOP_FIFO_STALL);