v4.19.13 snapshot.
diff --git a/include/linux/bsearch.h b/include/linux/bsearch.h
new file mode 100644
index 0000000..62b1eb3
--- /dev/null
+++ b/include/linux/bsearch.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_BSEARCH_H
+#define _LINUX_BSEARCH_H
+
+#include <linux/types.h>
+
+void *bsearch(const void *key, const void *base, size_t num, size_t size,
+	      int (*cmp)(const void *key, const void *elt));
+
+#endif /* _LINUX_BSEARCH_H */