[NET]: SH64 checksum annotations and cleanups.

* sanitize prototypes, annotate
* collapse csum_partial_copy
* kill csum_partial_copy_fromuser
* ntohs->shift in checksum calculation

Signed-off-by: Al Viro <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

arch/sh64/kernel/sh_ksyms.c

···
 EXPORT_SYMBOL(kernel_thread);
 
 /* Networking helper routines. */
-EXPORT_SYMBOL(csum_partial_copy);
+EXPORT_SYMBOL(csum_partial_copy_nocheck);
 
 EXPORT_SYMBOL(strstr);
 

arch/sh64/lib/c-checksum.c

···
 
 /* computes the checksum of a memory block at buff, length len,
    and adds in "sum" (32-bit)  */
-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 long 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);
 
 	pr_debug("csum_partial, buff %p len %d sum 0x%x result=0x%016Lx\n",
 		buff, len, sum, result);
 
-	return result;
+	return (__force __wsum)result;
 }
 
 /* Copy while checksumming, otherwise like csum_partial.  */
-unsigned int
-csum_partial_copy(const unsigned char *src, unsigned char *dst, int len, unsigned int sum)
+__wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
 {
 	sum = csum_partial(src, len, sum);
 	memcpy(dst, src, len);
···
 
 /* Copy from userspace and compute checksum.  If we catch an exception
    then zero the rest of the buffer.  */
-unsigned int
-csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst, int len,
-			    unsigned int sum, int *err_ptr)
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst, int len,
+			    __wsum sum, int *err_ptr)
 {
 	int missing;
 
···
 }
 
 /* Copy to userspace and compute checksum.  */
-unsigned int
+__wsum
 csum_partial_copy_to_user(const unsigned char *src, unsigned char *dst, int len,
-			  unsigned int sum, int *err_ptr)
+			  __wsum sum, int *err_ptr)
 {
 	sum = csum_partial(src, len, sum);
 
···
  *	This is a version of ip_compute_csum() optimized for IP headers,
  *	which always checksum on 4 octet boundaries.
  */
-unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
+__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 {
 	pr_debug("ip_fast_csum %p,%d\n", iph, ihl);
 
-	return ~do_csum(iph, ihl * 4);
+	return (__force __sum16)~do_csum(iph, ihl * 4);
 }
 
-unsigned int csum_tcpudp_nofold(unsigned long saddr,
-				unsigned long daddr,
+__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 				unsigned short len,
-				unsigned short proto, unsigned int sum)
+				unsigned short proto, __wsum sum)
 {
 	unsigned long long result;
 
 	pr_debug("ntohs(0x%x)=0x%x\n", 0xdead, ntohs(0xdead));
 	pr_debug("htons(0x%x)=0x%x\n", 0xdead, htons(0xdead));
 
-	result = ((unsigned long long) saddr +
-		  (unsigned long long) daddr +
-		  (unsigned long long) sum +
-		  ((unsigned long long) ntohs(len) << 16) +
-		  ((unsigned long 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 loose in the typedef-less
 	   network stack.  */
···
 	pr_debug("%s saddr %x daddr %x len %x proto %x sum %x result %08Lx\n",
 		__FUNCTION__, saddr, daddr, len, proto, sum, result);
 
-	return result;
-}
-
-// Post SIM:
-unsigned int
-csum_partial_copy_nocheck(const unsigned char *src, unsigned char *dst, int len, unsigned int sum)
-{
-	//  unsigned dummy;
-	pr_debug("csum_partial_copy_nocheck src %p dst %p len %d\n", src, dst,
-		len);
-
-	return csum_partial_copy(src, dst, len, sum);
+	return (__wsum)result;
 }

include/asm-sh64/checksum.h

···
  *
  * 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);
 
 /*
  *	Note: when you get a NULL pointer exception here this means someone
···
  */
 
 
-unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len,
-				       unsigned int sum);
+__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
+				       __wsum sum);
 
-unsigned int csum_partial_copy_from_user(const char *src, 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);
 
-/*
- * These are the old (and unsafe) way of doing checksums, a warning message will be
- * printed if they are used and an exeption occurs.
- *
- * these functions should go away after some time.
- */
-
-#define csum_partial_copy_fromuser csum_partial_copy
-
-unsigned int csum_partial_copy(const char *src, char *dst, int len,
-			       unsigned int sum);
-
-static inline unsigned short csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum csum)
 {
+	u32 sum = (__force u32)csum;
         sum = (sum & 0xffff) + (sum >> 16);
         sum = (sum & 0xffff) + (sum >> 16);
-        return ~(sum);
+        return (__force __sum16)~sum;
 }
 
-unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
+__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 
-unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
+__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 				 unsigned short len, unsigned short proto,
-				 unsigned int sum);
+				 __wsum sum);
 
 /*
  * 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));
 }
···
  * this routine is used for miscellaneous IP-like checksums, mainly
  * 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));
 }