> > Use a newer compiler - modern ones get this right.
>
> : static void serial_unlink_irq_chain(struct uart_8250_port *up)
> : {
> : struct irq_info *i;
> : struct hlist_node *n;
> : struct hlist_head *h;
> :
> : mutex_lock(&hash_mutex);
> :
> : h = &irq_lists[up->port.irq % NR_IRQ_HASH];
> :
> : hlist_for_each(n, h) {
> : i = hlist_entry(n, struct irq_info, node);
> : if (i->irq == up->port.irq)
> : break;
> : }
> :
> : BUG_ON(n == NULL);
> : BUG_ON(i->head == NULL);
>
> How can any compiler possibly determine that the hlist_for_each() is
> never executed zero times?
We had this argument was it two years ago ?
Modern gcc is capable of at least working out it can't work it out and
doesn't emit a spurious warning.
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