1 files changed, 31 insertions, 0 deletions
diff --git a/backport-include/linux/rhashtable.h b/backport-include/linux/rhashtable.h
new file mode 100644
index 0000000..8e493bc
--- /dev/null
+++ b/backport-include/linux/rhashtable.h
@@ -0,0 +1,31 @@
+#ifndef __BACKPORT_RHASHTABLE_H
+#define __BACKPORT_RHASHTABLE_H
+#include_next <linux/rhashtable.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_IS_LESS(4,12,0)
+/**
+ * rhashtable_lookup_get_insert_fast - lookup and insert object into hash table
+ * @ht:		hash table
+ * @obj:	pointer to hash head inside object
+ * @params:	hash table parameters
+ *
+ * Just like rhashtable_lookup_insert_fast(), but this function returns the
+ * object if it exists, NULL if it did not and the insertion was successful,
+ * and an ERR_PTR otherwise.
+ */
+#define rhashtable_lookup_get_insert_fast LINUX_BACKPORT(rhashtable_lookup_get_insert_fast)
+static inline void *rhashtable_lookup_get_insert_fast(
+	struct rhashtable *ht, struct rhash_head *obj,
+	const struct rhashtable_params params)
+{
+	const char *key = rht_obj(ht, obj);
+
+	BUG_ON(ht->p.obj_hashfn);
+
+	return __rhashtable_insert_fast(ht, key + ht->p.key_offset, obj, params,
+					false);
+}
+#endif
+
+#endif /* __BACKPORT_RHASHTABLE_H */