[NET]: SH checksum annotations and cleanups.

* sanitize prototypes, annotate
* kill useless shifts
* usual ntohs->shift
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-sh/checksum.h

@@ -23,7 +23,7 @@
  *
  * it's best to have buff aligned on a 32-bit boundary
  */
-asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
+asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
 
 /*
  * the same as csum_partial, but copies from src while it
@@ -33,8 +33,8 @@ asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsign
  * better 64-bit) boundary
  */
 
-asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsigned char *dst,
-						  int len, int sum, int *src_err_ptr, int *dst_err_ptr);
+asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
+					  int len, __wsum sum, int *src_err_ptr, int *dst_err_ptr);
 
 /*
  *	Note: when you get a NULL pointer exception here this means someone
@@ -44,24 +44,25 @@ asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsi
  *	access_ok().
  */
 static __inline__
-unsigned int csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst,
-					int len, int sum)
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+					int len, __wsum sum)
 {
 	return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
 }
 
 static __inline__
-unsigned int csum_partial_copy_from_user (const unsigned char *src, unsigned char *dst,
-						int len, int sum, int *err_ptr)
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+						int len, __wsum sum, int *err_ptr)
 {
-	return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
+	return csum_partial_copy_generic((__force const void *)src, dst,
+					len, sum, err_ptr, NULL);
 }
 
 /*
  *	Fold a partial checksum
  */
 
-static __inline__ unsigned int csum_fold(unsigned int sum)
+static __inline__ __sum16 csum_fold(__wsum sum)
 {
 	unsigned int __dummy;
 	__asm__("swap.w %0, %1\n\t"
@@ -74,7 +75,7 @@ static __inline__ unsigned int csum_fold(unsigned int sum)
 		: "=r" (sum), "=&r" (__dummy)
 		: "0" (sum)
 		: "t");
-	return sum;
+	return (__force __sum16)sum;
 }
 
 /*
@@ -84,7 +85,7 @@ static __inline__ unsigned int csum_fold(unsigned int sum)
  *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
  *      for linux by * Arnt Gulbrandsen.
  */
-static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
+static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 {
 	unsigned int sum, __dummy0, __dummy1;
 
@@ -112,16 +113,15 @@ static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int
 	return	csum_fold(sum);
 }
 
-static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
-						   unsigned long daddr,
+static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 						   unsigned short len,
 						   unsigned short proto,
-						   unsigned int sum) 
+						   __wsum sum)
 {
 #ifdef __LITTLE_ENDIAN__
-	unsigned long len_proto = (ntohs(len)<<16)+proto*256;
+	unsigned long len_proto = (proto + len) << 8;
 #else
-	unsigned long len_proto = (proto<<16)+len;
+	unsigned long len_proto = proto + len;
 #endif
 	__asm__("clrt\n\t"
 		"addc	%0, %1\n\t"
@@ -139,11 +139,10 @@ static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
  * computes the checksum of the TCP/UDP pseudo-header
  * returns a 16-bit checksum, already complemented
  */
-static __inline__ unsigned short int csum_tcpudp_magic(unsigned long saddr,
-						       unsigned long daddr,
+static __inline__ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 						       unsigned short len,
 						       unsigned short proto,
-						       unsigned int sum) 
+						       __wsum sum)
 {
 	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
 }
@@ -153,18 +152,17 @@ static __inline__ unsigned short int csum_tcpudp_magic(unsigned long saddr,
  * in icmp.c
  */
 
-static __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len)
+static __inline__ __sum16 ip_compute_csum(const void *buff, int len)
 {
     return csum_fold (csum_partial(buff, len, 0));
 }
 
 #define _HAVE_ARCH_IPV6_CSUM
 #ifdef CONFIG_IPV6
-static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
-						     struct in6_addr *daddr,
-						     __u32 len,
-						     unsigned short proto,
-						     unsigned int sum) 
+static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+					  const struct in6_addr *daddr,
+					  __u32 len, unsigned short proto,
+					  __wsum sum)
 {
 	unsigned int __dummy;
 	__asm__("clrt\n\t"
@@ -201,17 +199,18 @@ static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
  *	Copy and checksum to user
  */
 #define HAVE_CSUM_COPY_USER
-static __inline__ unsigned int csum_and_copy_to_user (const unsigned char *src,
-						      unsigned char __user *dst,
-						      int len, int sum,
+static __inline__ __wsum csum_and_copy_to_user (const void *src,
+						      void __user *dst,
+						      int len, __wsum sum,
 						      int *err_ptr)
 {
 	if (access_ok(VERIFY_WRITE, dst, len))
-		return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);
+		return csum_partial_copy_generic((__force const void *)src,
+						dst, len, sum, NULL, err_ptr);
 
 	if (len)
 		*err_ptr = -EFAULT;
 
-	return -1; /* invalid checksum */
+	return (__force __wsum)-1; /* invalid checksum */
 }
 #endif /* __ASM_SH_CHECKSUM_H */