Re: [tip: x86/urgent] x86/resctrl: Fix SNC detection

[Moger, Babu]

Hi Tony,

On 4/28/2026 3:52 PM, Luck, Tony wrote:
> On Tue, Apr 28, 2026 at 03:41:51PM -0500, Babu Moger wrote:
> > Hi Tony,
>   ...
> > Saw these messages on AMD system(7.1.0-rc1).
> >
> > sudo dmesg |grep CoD
> > [    6.614667] resctrl: CoD enabled system? Resctrl not supported
> >
> >
> > Might confuse some users. Not a big deal. But we should fix it in next
> > version.
>
> Babu,
>
> Indeed yes. Thanks for letting me know.
>
> I think this should fix it. Can you test please?
>
> -Tony
>
> ---
>
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
> index 497cc57ac135..3d72ff5d0c25 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -374,7 +374,12 @@ static const struct x86_cpu_id snc_cpu_ids[] __initconst = {
>   
>   static __init int snc_get_config(void)
>   {
> -	int ret = topology_num_nodes_per_package();
> +	int ret;
> +
> +	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
> +		return 1;
> +
> +	ret = topology_num_nodes_per_package();
>   
>   	if (ret > 1 && !x86_match_cpu(snc_cpu_ids)) {
>   		pr_warn("CoD enabled system? Resctrl not supported\n");
> >

Yes. it fixes it. Thanks

Babu