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Diffstat (limited to 'arch/x86/kernel/smpboot.c')
-rw-r--r--arch/x86/kernel/smpboot.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c2871d3..8ed8908 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -312,6 +312,26 @@ void __cpuinit smp_store_cpu_info(int id)
identify_secondary_cpu(c);
}
+static void __cpuinit check_cpu_siblings_on_same_node(int cpu1, int cpu2)
+{
+ int node1 = early_cpu_to_node(cpu1);
+ int node2 = early_cpu_to_node(cpu2);
+
+ /*
+ * Our CPU scheduler assumes all logical cpus in the same physical cpu
+ * share the same node. But, buggy ACPI or NUMA emulation might assign
+ * them to different node. Fix it.
+ */
+ if (node1 != node2) {
+ pr_warning("CPU %d in node %d and CPU %d in node %d are in the same physical CPU. forcing same node %d\n",
+ cpu1, node1, cpu2, node2, node2);
+
+ numa_remove_cpu(cpu1);
+ numa_set_node(cpu1, node2);
+ numa_add_cpu(cpu1);
+ }
+}
+
static void __cpuinit link_thread_siblings(int cpu1, int cpu2)
{
cpumask_set_cpu(cpu1, cpu_sibling_mask(cpu2));
@@ -320,6 +340,7 @@ static void __cpuinit link_thread_siblings(int cpu1, int cpu2)
cpumask_set_cpu(cpu2, cpu_core_mask(cpu1));
cpumask_set_cpu(cpu1, cpu_llc_shared_mask(cpu2));
cpumask_set_cpu(cpu2, cpu_llc_shared_mask(cpu1));
+ check_cpu_siblings_on_same_node(cpu1, cpu2);
}
@@ -361,10 +382,12 @@ void __cpuinit set_cpu_sibling_map(int cpu)
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));
+ check_cpu_siblings_on_same_node(cpu, 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));
+ check_cpu_siblings_on_same_node(cpu, i);
/*
* Does this new cpu bringup a new core?
*/
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