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Date: Sat, 2 May 2020 23:05:28 +0000 (UTC)
From: Christopher Lameter <cl@linux.com>
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To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
cc: Andrew Morton <akpm@linux-foundation.org>, linuxppc-dev@lists.ozlabs.org, 
    linux-mm@kvack.org, linux-kernel@vger.kernel.org, 
    Michal Hocko <mhocko@suse.com>, Mel Gorman <mgorman@suse.de>, 
    Vlastimil Babka <vbabka@suse.cz>, 
    "Kirill A. Shutemov" <kirill@shutemov.name>, 
    Michael Ellerman <mpe@ellerman.id.au>, 
    Linus Torvalds <torvalds@linux-foundation.org>, 
    Gautham R Shenoy <ego@linux.vnet.ibm.com>
Subject: Re: [PATCH v3 3/3] mm/page_alloc: Keep memoryless cpuless node 0
 offline
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On Fri, 1 May 2020, Srikar Dronamraju wrote:

> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -116,8 +116,10 @@ EXPORT_SYMBOL(latent_entropy);
>   */
>  nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
>  	[N_POSSIBLE] = NODE_MASK_ALL,
> +#ifdef CONFIG_NUMA
> +	[N_ONLINE] = NODE_MASK_NONE,

Hmmm.... I would have expected that you would have added something early
in boot that would mark the current node (whatever is is) online instead?