v4.19.13 snapshot.
diff --git a/include/linux/crc32c.h b/include/linux/crc32c.h
new file mode 100644
index 0000000..bd21af8
--- /dev/null
+++ b/include/linux/crc32c.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_CRC32C_H
+#define _LINUX_CRC32C_H
+
+#include <linux/types.h>
+
+extern u32 crc32c(u32 crc, const void *address, unsigned int length);
+extern const char *crc32c_impl(void);
+
+/* This macro exists for backwards-compatibility. */
+#define crc32c_le crc32c
+
+#endif /* _LINUX_CRC32C_H */