v4.19.13 snapshot.
diff --git a/arch/x86/include/asm/delay.h b/arch/x86/include/asm/delay.h
new file mode 100644
index 0000000..de9e784
--- /dev/null
+++ b/arch/x86/include/asm/delay.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_DELAY_H
+#define _ASM_X86_DELAY_H
+
+#include <asm-generic/delay.h>
+
+void use_tsc_delay(void);
+void use_mwaitx_delay(void);
+
+#endif /* _ASM_X86_DELAY_H */