linux-kernel - Re: [PATCH v6 4/4] of/fdt: mark hotpluggable memory

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Message-Id: <20161114193451.bzowsi6csesoxwap@arbab-laptop.austin.ibm.com>
Date:   Mon, 14 Nov 2016 13:34:52 -0600
From:   Reza Arbab <arbab@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, devicetree@...r.kernel.org,
        Bharata B Rao <bharata@...ux.vnet.ibm.com>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Alistair Popple <apopple@....ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/4] of/fdt: mark hotpluggable memory

On Mon, Nov 14, 2016 at 10:59:43PM +1100, Michael Ellerman wrote:
>So I'm not opposed to this, but it is a little vague.
>
>What does the "hotpluggable" property really mean?
>
>Is it just a hint to the operating system? (which may or may not be
>Linux).
>
>Or is it a direction, "this memory must be able to be hotunplugged"?
>
>I think you're intending the former, ie. a hint, which is probably OK.
>But it needs to be documented clearly.

Yes, you've got it right. It's just a hint, not a mandate.

I'm about to send v7 which adds a description of "hotpluggable" in the 
documentation. Hopefully I've explained it well enough there.

-- 
Reza Arbab