Re: [PATCH net-next 01/17] net: sched: refactor mini_qdisc_pair_swap() to use workqueue

[David Miller]

From: Vlad Buslov <vla...@mellanox.com>
Date: Mon, 12 Nov 2018 09:55:30 +0200

> +void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
> +                       struct tcf_proto *tp_head)
> +{
> +     xchg(&miniqp->tp_head, tp_head);

If you are not checking the return value of xchg(), then this is
simply a store with optionally a memory barrier of some sort
either before or after.