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

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Message-ID: <CAPcyv4i1phF5rZL--g6ojguHScKetNA3gfsZRpHhVw3VbgqmFg@mail.gmail.com>
Date:   Mon, 13 Mar 2017 12:44:25 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        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 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>