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Subject[RFC][PATCH 4/5] x86: Hard partition cpu topology masks on node boundaries
When using numa=fake= you can get weird topologies where LLCs can span
nodes and other such nonsense. Cure this by hard partitioning these
masks on node boundaries.

Cc: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: x86@kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
arch/x86/kernel/smpboot.c | 11 +++++++++++
1 file changed, 11 insertions(+)

--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -337,6 +337,11 @@ void __cpuinit set_cpu_sibling_map(int c
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))
+ continue;
+#endif
+
if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
if (c->phys_proc_id == o->phys_proc_id &&
per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i) &&
@@ -360,11 +365,17 @@ void __cpuinit set_cpu_sibling_map(int c
}

for_each_cpu(i, cpu_sibling_setup_mask) {
+#ifdef CONFIG_NUMA_EMU
+ if (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)) {
cpumask_set_cpu(i, cpu_llc_shared_mask(cpu));
cpumask_set_cpu(cpu, cpu_llc_shared_mask(i));
}
+
if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
cpumask_set_cpu(i, cpu_core_mask(cpu));
cpumask_set_cpu(cpu, cpu_core_mask(i));



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