2 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/crc8.h b/include/linux/crc8.h
new file mode 100644
index 000000000..b5fd2ac9d
--- /dev/null
+++ b/include/linux/crc8.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+
+#ifndef __linux_crc8_h
+#define __linux_crc8_h
+
+/**
+ * crc8() - Calculate and return CRC-8 of the data
+ *
+ * This uses an x^8 + x^2 + x + 1 polynomial.  A table-based algorithm would
+ * be faster, but for only a few bytes it isn't worth the code size
+ *
+ * @vptr: Buffer to checksum
+ * @len: Length of buffer in bytes
+ * @return CRC8 checksum
+ */
+unsigned int crc8(const unsigned char *vptr, int len);
+
+#endif
diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index 39c712eac..7435fcd02 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -48,6 +48,10 @@
 	.globl SYMBOL_NAME(name); \
 	LENTRY(name)
 
+#define WEAK(name) \
+	.weak SYMBOL_NAME(name); \
+	LENTRY(name)
+
 #ifndef END
 #define END(name) \
 	.size name, .-name