On 3/21/23 09:40, Matthew Wilcox wrote: > 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? It's _possible_ for sure, just unlikely. The most likely place these days is probably a teensy tiny VM that just happens to have some performance-differentiated memory exposed to it for some reason. Maybe it's got a slice of slow PMEM or fast High-Bandwidth memory for whatever reason.
