patch-1.3.31 linux/include/asm-alpha/checksum.h

• Lines: 16
• Date: Tue Oct 3 12:18:54 1995
• Orig file: v1.3.30/linux/include/asm-alpha/checksum.h
• Orig date: Wed Aug 2 13:21:16 1995

diff -u --recursive --new-file v1.3.30/linux/include/asm-alpha/checksum.h linux/include/asm-alpha/checksum.h
@@ -55,4 +55,15 @@
 
 extern unsigned short ip_compute_csum(unsigned char * buff, int len);
 
+/*
+ *	Fold a partial checksum without adding pseudo headers
+ */
+
+static inline unsigned short csum_fold(unsigned int sum)
+{
+	sum = (sum & 0xffff) + (sum >> 16);
+	sum = (sum & 0xffff) + (sum >> 16);
+	return ~sum;
+}
+
 #endif