linux-kernel - Re: [PATCH V2 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

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Message-ID: <87tw4889fc.fsf@concordia.ellerman.id.au>
Date:   Fri, 26 May 2017 15:38:15 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bharata B Rao <bharata@...ux.vnet.ib>,
        Balbir Singh <bsingharora@...il.com>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        Shailendra Singh <shailendras@...dia.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH V2 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

Michael Bringmann <mwb@...ux.vnet.ibm.com> writes:

> Removing or adding memory via the PowerPC hotplug interface shows
> anomalies in the association between memory and nodes.

What anomalies? Please describe the actual problem you're seeing, with
details, and why you think this is the correct fix.

This is a revert of 3af229f2071f ("powerpc/numa: Reset node_possible_map
to only node_online_map"), so please explain why all the things
mentioned in the change log for that commit are either wrong or no
longer true.

cheers