Paul E. McKenney <[email protected]> wrote:
>>
>> > net/decnet/dn_route.c in dn_rt_cache_get_next() is as follows:
>> >
>> > static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
>> > {
>> > struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private);
>> >
>> > rt = rt->u.dst.dn_next;
>> > while(!rt) {
>> > rcu_read_unlock_bh();
>> > if (--s->bucket < 0)
>> > break;
>
> OK, for my next stupid question: why is the rcu_dereference(seq->private)
> required, as opposed to simply seq->private?
It was put there by someone who went through the code converting
all occurances of smp_read_barrier_depends to rcu_dereference.
In this instance the rcu_dereference conversion doesn't make much
sense so we should probably just revert it.
Cheers,
--
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