include/linux/smp.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index cfa2d20..ad48077 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -149,6 +149,8 @@ smp_call_function_any(const struct cpumask *mask, void (*func)(void *info),
 	return smp_call_function_single(0, func, info, wait);
 }
 
+static inline const struct cpumask *cpu_sibling_mask(int cpu) { return NULL; }
+
 #endif /* !SMP */
 
 /*