diff -Nur a/kernel/sched/MuQSS.c b/kernel/sched/MuQSS.c
--- a/kernel/sched/MuQSS.c	2019-06-19 19:58:03.175461132 +0100
+++ b/kernel/sched/MuQSS.c	2019-06-19 20:00:22.120083431 +0100
@@ -1013,6 +1013,7 @@
 
 #ifdef CONFIG_SCHED_SMT
 DEFINE_STATIC_KEY_FALSE(sched_smt_present);
+EXPORT_SYMBOL_GPL(sched_smt_present);
 #endif
 
 /*