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-rw-r--r--mm/hmm.c8
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;