netdev - Re: [PATCH ipsec 5/7] xfrm: policy: fix reinsertion on node merge

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Date:   Sat, 5 Jan 2019 10:57:08 +0100
From:   Florian Westphal <fw@...len.de>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Florian Westphal <fw@...len.de>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH ipsec 5/7] xfrm: policy: fix reinsertion on node merge

Cong Wang <xiyou.wangcong@...il.com> wrote:
> > -       hlist_for_each_entry(tmp, &v->hhead, bydst)
> > -               tmp->bydst_reinsert = true;
> > -       hlist_for_each_entry(tmp, &n->hhead, bydst)
> > +       hlist_for_each_entry(tmp, &v->hhead, bydst) {
> 
> 
> hlist_for_each_entry_safe()?

Good question.  Its not necessary from a technical point of view
because tmp isn't free'd and hlist_del_rcu leaves tmp->next alone.

But perhaps its still better to use _safe variant.

I'll let Steffen decide.