v4.19.13 snapshot.
diff --git a/arch/arm/include/asm/limits.h b/arch/arm/include/asm/limits.h
new file mode 100644
index 0000000..ab15937
--- /dev/null
+++ b/arch/arm/include/asm/limits.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_PIPE_H
+#define __ASM_PIPE_H
+
+#ifndef PAGE_SIZE
+#include <asm/page.h>
+#endif
+
+#define PIPE_BUF	PAGE_SIZE
+
+#endif
+