linux-kernel - Re: [PATCH V6 1/2] powerpc/hotplug: Ensure enough nodes avail for operations

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Message-ID: <878tklu0pw.fsf@concordia.ellerman.id.au>
Date:   Wed, 21 Jun 2017 19:52:27 +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>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        John Allen <jallen@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bharata B Rao <bharata@...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>,
        Rashmica Gupta <rashmicy@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Subject: Re: [PATCH V6 1/2] powerpc/hotplug: Ensure enough nodes avail for operations

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

> powerpc/hotplug: On systems like PowerPC which allow 'hot-add' of CPU
> or memory resources, it may occur that the new resources are to be
> inserted into nodes that were not used for these resources at bootup.
> In the kernel, any node that is used must be defined and initialized
> at boot.  In order to meet both needs, this patch adds a new kernel
> command line option (numnodes=<int>) for use by the PowerPC architecture-

Sorry, that's a hack.

I thought you were going to use firmware properties to find the set of
possible nodes. Did that not work?

cheers