linux-kernel - Re: [PATCH] mm: drop hotplug lock from lru_add_drain

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Message-ID: <alpine.DEB.2.20.1711141611070.2044@nanos>
Date:   Tue, 14 Nov 2017 16:11:31 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Michal Hocko <mhocko@...nel.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: drop hotplug lock from lru_add_drain_all

On Tue, 14 Nov 2017, Thomas Gleixner wrote:

> On Tue, 14 Nov 2017, Michal Hocko wrote:
> 
> > On Tue 14-11-17 15:23:47, Michal Hocko wrote:
> > [...]
> > > +/*
> > > + * Doesn't need any cpu hotplug locking because we do rely on per-cpu
> > > + * kworkers being shut down before our page_alloc_cpu_dead callback is
> > > + * executed on the offlined cpu
> > > + */
> > >  void lru_add_drain_all(void)
> > >  {
> > >  	static DEFINE_MUTEX(lock);
> > 
> > Ble the part of the comment didn't go through
> 
> Looks good.

With that added, feel free to add:

Acked-by: Thomas Gleixner <tglx@...utronix.de>