v4.19.13 snapshot.
diff --git a/include/linux/kbuild.h b/include/linux/kbuild.h
new file mode 100644
index 0000000..e7be517
--- /dev/null
+++ b/include/linux/kbuild.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_KBUILD_H
+#define __LINUX_KBUILD_H
+
+#define DEFINE(sym, val) \
+ asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val))
+
+#define BLANK() asm volatile("\n.ascii \"->\"" : : )
+
+#define OFFSET(sym, str, mem) \
+ DEFINE(sym, offsetof(struct str, mem))
+
+#define COMMENT(x) \
+ asm volatile("\n.ascii \"->#" x "\"")
+
+#endif