1 files changed, 8 insertions, 0 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index f6c745b9a25a..3c6265d4254b 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -25,9 +25,17 @@
 #include <linux/sched.h>
 #include <linux/swapops.h>
 #include <linux/hugetlb.h>
+#include <linux/jump_label.h>
 #include <linux/mmu_notifier.h>
 
 
+/*
+ * Device private memory see HMM (Documentation/vm/hmm.txt) or hmm.h
+ */
+DEFINE_STATIC_KEY_FALSE(device_private_key);
+EXPORT_SYMBOL(device_private_key);
+
+
 #ifdef CONFIG_HMM
 static const struct mmu_notifier_ops hmm_mmu_notifier_ops;