x86/numa: Check for nonsensical topologies on real hw as well

Instead of only checking nonsensical topologies on numa-emu, do it
on real hardware as well, and print a warning.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/n/tip-re15l0jqjtpz709oxozt2zoh@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index edfd03a..7c53d96 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -337,10 +337,10 @@ void __cpuinit set_cpu_sibling_map(int cpu)
                for_each_cpu(i, cpu_sibling_setup_mask) {
                        struct cpuinfo_x86 *o = &cpu_data(i);
 
-#ifdef CONFIG_NUMA_EMU
-                       if (cpu_to_node(cpu) != cpu_to_node(i))
+                       if (cpu_to_node(cpu) != cpu_to_node(i)) {
+                               WARN_ONCE(1, "sched: CPU #%d's thread-sibling CPU #%d not on the same node! [node %d != %d]. Ignoring sibling dependency.\n", cpu, i, cpu_to_node(cpu), cpu_to_node(i));
                                continue;
-#endif
+                       }
 
                        if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
                                if (c->phys_proc_id == o->phys_proc_id &&
@@ -365,10 +365,10 @@ void __cpuinit set_cpu_sibling_map(int cpu)
        }
 
        for_each_cpu(i, cpu_sibling_setup_mask) {
-#ifdef CONFIG_NUMA_EMU
-               if (cpu_to_node(cpu) != cpu_to_node(i))
+               if (cpu_to_node(cpu) != cpu_to_node(i)) {
+                       WARN_ONCE(1, "sched: CPU #%d's core-sibling CPU #%d not on the same node! [node %d != %d]. Ignoring sibling dependency.\n", cpu, i, cpu_to_node(cpu), cpu_to_node(i));
                        continue;
-#endif
+               }
 
                if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
                    per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {