v4.19.13 snapshot.
diff --git a/arch/x86/boot/code16gcc.h b/arch/x86/boot/code16gcc.h
new file mode 100644
index 0000000..e19fd75
--- /dev/null
+++ b/arch/x86/boot/code16gcc.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#
+# code16gcc.h
+#
+# This file is added to the assembler via -Wa when compiling 16-bit C code.
+# This is done this way instead via asm() to make sure gcc does not reorder
+# things around us.
+#
+# gcc 4.9+ has a real -m16 option so we can drop this hack long term.
+#
+
+ .code16gcc