linux-kernel - Re: [PATCH v2 8/9] sched: Don't reinvent the wheel but use existing llist API

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Message-ID: <20170213155229.GA1663@redhat.com>
Date:   Mon, 13 Feb 2017 16:52:30 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Byungchul Park <byungchul.park@....com>, mingo@...nel.org,
        neilb@...e.de, nab@...ux-iscsi.org, viro@...iv.linux.org.uk,
        ying.huang@...el.com, shli@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/9] sched: Don't reinvent the wheel but use existing
 llist API

On 02/13, Peter Zijlstra wrote:
>
> On Mon, Feb 13, 2017 at 04:21:08PM +0900, Byungchul Park wrote:
> > +	llist_for_each_entry(p, llist, wake_entry)
> > +		ttwu_do_activate(rq, p, p->sched_remote_wakeup ? WF_MIGRATED : 0, &rf);
>
> I think this suffers the exact same problem the others did. After
> ttwu_do_activate() the llist entry can be reused, so doing list_next()
> after it is flaky.

llist_for_each_entry_safe() should work, I guess.

Oleg.