1 files changed, 6 insertions, 1 deletions

diff --git a/include/asm-x86/topology.h b/include/asm-x86/topology.h
index 1f97758de4ab..98e5f17ea856 100644
--- a/include/asm-x86/topology.h
+++ b/include/asm-x86/topology.h
@@ -57,7 +57,12 @@ static inline int cpu_to_node(int cpu)
 }
 #define early_cpu_to_node(cpu)  cpu_to_node(cpu)
 
-/* Returns a bitmask of CPUs on Node 'node'. */
+/* Returns a bitmask of CPUs on Node 'node'.
+ *
+ * Side note: this function creates the returned cpumask on the stack
+ * so with a high NR_CPUS count, excessive stack space is used.  The
+ * node_to_cpumask_ptr function should be used whenever possible.
+ */
 static inline cpumask_t node_to_cpumask(int node)
 {
         return node_to_cpumask_map[node];