Re: [PATCH] mm/slab: Fix undefined init_cache_node_node() for NUMA and !SMP

[Matthew Wilcox]

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?