v4.19.13 snapshot.
diff --git a/arch/powerpc/include/asm/shmparam.h b/arch/powerpc/include/asm/shmparam.h
new file mode 100644
index 0000000..bc09688
--- /dev/null
+++ b/arch/powerpc/include/asm/shmparam.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_SHMPARAM_H
+#define _ASM_POWERPC_SHMPARAM_H
+
+#define	SHMLBA PAGE_SIZE		 /* attach addr a multiple of this */
+
+#endif	/* _ASM_POWERPC_SHMPARAM_H */