Re: [PATCH 2/2] fs/dcache: Make negative dentries easier to be reclaimed

[Matthew Wilcox]

On Tue, Aug 28, 2018 at 01:19:40PM -0400, Waiman Long wrote:
> @@ -134,7 +135,7 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item)
>  	spin_lock(&nlru->lock);
>  	if (list_empty(item)) {
>  		l = list_lru_from_kmem(nlru, item, &memcg);
> -		list_add_tail(item, &l->list);
> +		(add_tail ? list_add_tail : list_add)(item, &l->list);
>  		/* Set shrinker bit if the first element was added */
>  		if (!l->nr_items++)
>  			memcg_set_shrinker_bit(memcg, nid,

That's not OK.  Write it out properly, ie:

		if (add_tail)
			list_add_tail(item, &l->list);
		else
			list_add(item, &l->list);