linux-kernel - Re: [PATCH 1/2] mm: add private lock to serialize memory hotplug operations

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Message-ID: <5904743.94GiNAKfGi@aspire.rjw.lan>
Date:   Mon, 13 Mar 2017 22:15:46 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Dan Williams <dan.j.williams@...el.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Ben Hutchings <ben@...adent.org.uk>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sebastian Ott <sebott@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] mm: add private lock to serialize memory hotplug operations

On Monday, March 13, 2017 12:44:25 PM Dan Williams wrote:
> On Mon, Mar 13, 2017 at 11:57 AM, Heiko Carstens
> <heiko.carstens@...ibm.com> wrote:
> > On Thu, Mar 09, 2017 at 11:34:44PM +0100, Rafael J. Wysocki wrote:
> >> > The memory described by devm_memremap_pages() is never "onlined" to
> >> > the core mm. We're only using arch_add_memory() to get a linear
> >> > mapping and page structures. The rest of memory hotplug is skipped,
> >> > and this ZONE_DEVICE memory is otherwise hidden from the core mm.
> >>
> >> OK, that should be fine then.
> >
> > So, does that mean that the patch is ok as it is? If so, it would be good
> > to get an Ack from both, you and Dan, please.
> 
> Acked-by: Dan Williams <dan.j.williams@...el.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>