x86/resctrl: Only check Intel systems for SNC

6f6947b2 · Tony Luck <[email protected]> · 2026-06-04 21:46:49 -07:00

topology_num_nodes_per_package() reports values greater than one on certain
AMD systems resulting in resctrl's Intel model specific SNC detection
printing the confusing message:

   "CoD enabled system? Resctrl not supported"

Add a check for Intel systems before looking at the topology.

[ reinette: Add Closes tag, fix tag typos, rework changelog ]

Fixes: 59674fc9d0bf ("x86/resctrl: Fix SNC detection")
Reported-by: Babu Moger <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Reinette Chatre <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Tested-by: Babu Moger <[email protected]>
Link: https://patch.msgid.link/9849330f45ac86344cc5ac54df2d313906d70bc4.1780634584.git.reinette.chatre@intel.com
Closes: https://lore.kernel.org/lkml/[email protected]/

Commit: 6f6947b2387e94e405f80d472f8a189bfbf2bd6c
Parents: b5f53e6d

Changes

1 files changed · +6 −1

File	Status	Add	Del	Content
arch/x86/kernel/cpu/resctrl/monitor.c	modified	+6	−1	View file

arch/x86/kernel/cpu/resctrl/monitor.c

View file

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 9bd87ba..59215fe 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -377,7 +377,12 @@ 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");