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Date:   Tue, 21 Mar 2023 16:40:48 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     Geert Uytterhoeven <geert+renesas@glider.be>
Cc:     Dave Hansen <dave.hansen@linux.intel.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Christoph Lameter <cl@linux.com>,
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        Andrew Morton <akpm@linux-foundation.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
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        linux-mm@kvack.org, linux-sh@vger.kernel.org,
        linux-kernel@vger.kernel.org, Randy Dunlap <rdunlap@infradead.org>
Subject: Re: [PATCH] mm/slab: Fix undefined init_cache_node_node() for NUMA
 and !SMP
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References: <67261c513706241d479b8b4cf46eb4e6fb0417ba.1679387262.git.geert+renesas@glider.be>
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On Tue, Mar 21, 2023 at 09:30:59AM +0100, Geert Uytterhoeven wrote:
> -#if (defined(CONFIG_NUMA) && defined(CONFIG_MEMORY_HOTPLUG)) || defined(CONFIG_SMP)
> +#if defined(CONFIG_NUMA) || defined(CONFIG_SMP)

I'm amused by the thought of CONFIG_NUMA without CONFIG_SMP.
Is it possible to have one node with memory and a single CPU, then
another node with memory and no CPU?