Date:   Tue, 16 Nov 2021 16:41:35 +0100
From:   Michal Hocko <mhocko@suse.com>
To:     Christoph Lameter <cl@gentwo.de>
Cc:     Dennis Zhou <dennis@kernel.org>,
        Alexey Makhalov <amakhalov@vmware.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "mm-commits@vger.kernel.org" <mm-commits@vger.kernel.org>,
        "osalvador@suse.de" <osalvador@suse.de>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "tj@kernel.org" <tj@kernel.org>
Subject: Re: + mm-fix-panic-in-__alloc_pages.patch added to -mm tree
Message-ID: <YZPRL7HtQGUUAVG4@dhcp22.suse.cz>
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On Tue 16-11-21 13:30:45, Christoph Lameter wrote:
> On Mon, 15 Nov 2021, Dennis Zhou wrote:
> 
> > I need some clarification here. It sounds like memoryless nodes work on
> > x86, but hotplug + memoryless nodes isn't a supported use case or you're
> > introducing it as a new use case?
> 
> Could you do that step by step?
> 
> First add the new node and ensure everything is ok and that the memory is
> online.
> 
> *After* that is done bring up the new processor and associate the
> processor with *online* memory.

We are discussing that in the original thread -
http://lkml.kernel.org/r/YZN3ExwL7BiDS5nj@dhcp22.suse.cz

This patch is a a workaround that problem in the pcp code.
 

-- 
Michal Hocko
SUSE Labs