Hello Prateek,
On Thu, Oct 01, 2026 at 07:28:45PM +0000, K Prateek Nayak wrote:
[ snip ]
> +static __init void init_sbm_topology(u32 max_apicid)
> +{
> + u32 sbm_shift = x86_topo_system.dom_shifts[TOPO_DIE_DOMAIN] - 1;
As sashiko reported, and also mentioned here:
https://lore.kernel.org/lkml/[email protected]/
Maybe x86_topo_system.dom_shifts[TOPO_DIE_DOMAIN - 1] ?
> + int num_sbm_instances, max_threads_per_instance;
> +
> + /*
> + * On Intel systems, memory controllers are present at TOPO_DIE_DOMAIN.
> + * On newer AMD and Hygon systems, LLC is at TOPO_TILE_DOMAIN so use
> + * that instead.
> + */
> + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
> + boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
> + sbm_shift = x86_topo_system.dom_shifts[TOPO_TILE_DOMAIN] - 1;
Ditto.
thanks,
Chenyu
