tizen 2.3.1 release

[platform/kernel/u-boot.git] / fs / ext4 / crc16.h

diff --git a/fs/ext4/crc16.h b/fs/ext4/crc16.h
index 5fd113a..d04146a 100644 (file)
--- a/fs/ext4/crc16.h
+++ b/fs/ext4/crc16.h
@@ -1,16 +1,25 @@
 /*
- * crc16.h - CRC-16 routine
+ *     crc16.h - CRC-16 routine
+ *
  * Implements the standard CRC-16:
- *  Width 16
- *  Poly  0x8005 (x16 + x15 + x2 + 1)
- *  Init  0
+ *   Width 16
+ *   Poly  0x8005 (x16 + x15 + x2 + 1)
+ *   Init  0
  *
  * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
+ *
  * This source code is licensed under the GNU General Public License,
  * Version 2. See the file COPYING for more details.
  */
+
 #ifndef __CRC16_H
 #define __CRC16_H
-extern unsigned int ext2fs_crc16(unsigned int crc,
-       const void *buffer, unsigned int len);
-#endif
+
+/* for an unknown reason, PPC treats __u16 as signed and keeps doing sign
+ * extension on the value.  Instead, use only the low 16 bits of an
+ * unsigned int for holding the CRC value to avoid this.
+ */
+typedef unsigned int crc16_t;
+
+extern crc16_t ext2fs_crc16(crc16_t crc, const void *buffer, unsigned int len);
+#endif /* __CRC16_H */