[NET]: IA64 checksum annotations and cleanups.

* sanitize prototypes, annotate
* ntohs -> shift in checksum calculations
* kill access_ok() in csum_partial_copy_from_user
* collapse do_csum_partial_copy_from_user

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/ia64/lib/checksum.c

@@ -33,32 +33,32 @@ from64to16 (unsigned long x)
  * computes the checksum of the TCP/UDP pseudo-header
  * returns a 16-bit checksum, already complemented.
  */
-unsigned short int
-csum_tcpudp_magic (unsigned long saddr, unsigned long daddr, unsigned short len,
-		   unsigned short proto, unsigned int sum)
+__sum16
+csum_tcpudp_magic (__be32 saddr, __be32 daddr, unsigned short len,
+		   unsigned short proto, __wsum sum)
 {
-	return ~from64to16(saddr + daddr + sum + ((unsigned long) ntohs(len) << 16) +
-			   ((unsigned long) proto << 8));
+	return (__force __sum16)~from64to16(
+		(__force u64)saddr + (__force u64)daddr +
+		(__force u64)sum + ((len + proto) << 8));
 }
 
 EXPORT_SYMBOL(csum_tcpudp_magic);
 
-unsigned int
-csum_tcpudp_nofold (unsigned long saddr, unsigned long daddr, unsigned short len,
-		    unsigned short proto, unsigned int sum)
+__wsum
+csum_tcpudp_nofold (__be32 saddr, __be32 daddr, unsigned short len,
+		    unsigned short proto, __wsum sum)
 {
 	unsigned long result;
 
-	result = (saddr + daddr + sum +
-		  ((unsigned long) ntohs(len) << 16) +
-		  ((unsigned long) proto << 8));
+	result = (__force u64)saddr + (__force u64)daddr +
+		 (__force u64)sum + ((len + proto) << 8);
 
 	/* Fold down to 32-bits so we don't lose in the typedef-less network stack.  */
 	/* 64 to 33 */
 	result = (result & 0xffffffff) + (result >> 32);
 	/* 33 to 32 */
 	result = (result & 0xffffffff) + (result >> 32);
-	return result;
+	return (__force __wsum)result;
 }
 
 extern unsigned long do_csum (const unsigned char *, long);
@@ -75,16 +75,15 @@ extern unsigned long do_csum (const unsigned char *, long);
  *
  * it's best to have buff aligned on a 32-bit boundary
  */
-unsigned int
-csum_partial (const unsigned char * buff, int len, unsigned int sum)
+__wsum csum_partial(const void *buff, int len, __wsum sum)
 {
-	unsigned long result = do_csum(buff, len);
+	u64 result = do_csum(buff, len);
 
 	/* add in old sum, and carry.. */
-	result += sum;
+	result += (__force u32)sum;
 	/* 32+c bits -> 32 bits */
 	result = (result & 0xffffffff) + (result >> 32);
-	return result;
+	return (__force __wsum)result;
 }
 
 EXPORT_SYMBOL(csum_partial);
@@ -93,10 +92,9 @@ EXPORT_SYMBOL(csum_partial);
  * this routine is used for miscellaneous IP-like checksums, mainly
  * in icmp.c
  */
-unsigned short
-ip_compute_csum (unsigned char * buff, int len)
+__sum16 ip_compute_csum (const void *buff, int len)
 {
-	return ~do_csum(buff,len);
+	return (__force __sum16)~do_csum(buff,len);
 }
 
 EXPORT_SYMBOL(ip_compute_csum);

arch/ia64/lib/csum_partial_copy.c

@@ -104,9 +104,9 @@ out:
  */
 extern unsigned long do_csum(const unsigned char *, long);
 
-static unsigned int
-do_csum_partial_copy_from_user (const unsigned char __user *src, unsigned char *dst,
-				int len, unsigned int psum, int *errp)
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst,
+				int len, __wsum psum, int *errp)
 {
 	unsigned long result;
 
@@ -122,30 +122,17 @@ do_csum_partial_copy_from_user (const unsigned char __user *src, unsigned char *
 	result = do_csum(dst, len);
 
 	/* add in old sum, and carry.. */
-	result += psum;
+	result += (__force u32)psum;
 	/* 32+c bits -> 32 bits */
 	result = (result & 0xffffffff) + (result >> 32);
-	return result;
+	return (__force __wsum)result;
 }
 
-unsigned int
-csum_partial_copy_from_user (const unsigned char __user *src, unsigned char *dst,
-			     int len, unsigned int sum, int *errp)
+__wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
 {
-	if (!access_ok(VERIFY_READ, src, len)) {
-		*errp = -EFAULT;
-		memset(dst, 0, len);
-		return sum;
-	}
-
-	return do_csum_partial_copy_from_user(src, dst, len, sum, errp);
-}
-
-unsigned int
-csum_partial_copy_nocheck(const unsigned char __user *src, unsigned char *dst,
-			  int len, unsigned int sum)
-{
-	return do_csum_partial_copy_from_user(src, dst, len, sum, NULL);
+	return csum_partial_copy_from_user((__force const void __user *)src,
+					   dst, len, sum, NULL);
 }
 
 EXPORT_SYMBOL(csum_partial_copy_nocheck);