[NET]: ARM checksum annotations and cleanups.

* sanitize prototypes, annotate
* kill csum_partial_copy
* usual ntohs->shift, this time in assembler part

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

include/asm-arm/checksum.h

@@ -23,7 +23,7 @@
  *
  * 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);
 
 /*
  * the same as csum_partial, but copies from src while it
@@ -33,26 +33,18 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
  * better 64-bit) boundary
  */
 
-unsigned int
-csum_partial_copy_nocheck(const char *src, char *dst, int len, 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 __user *src, char *dst, int len, int sum, int *err_ptr);
-
-/*
- * This is the old (and unsafe) way of doing checksums, a warning message will
- * be printed if it is used and an exception occurs.
- *
- * this functions should go away after some time.
- */
-#define csum_partial_copy(src,dst,len,sum)	csum_partial_copy_nocheck(src,dst,len,sum)
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr);
 
 /*
  *	This is a version of ip_compute_csum() optimized for IP headers,
  *	which always checksum on 4 octet boundaries.
  */
-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, tmp1;
 
@@ -78,14 +70,13 @@ ip_fast_csum(unsigned char * iph, unsigned int ihl)
 	: "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (tmp1)
 	: "1" (iph), "2" (ihl)
 	: "cc", "memory");
-	return sum;
+	return (__force __sum16)sum;
 }
 
 /*
  * 	Fold a partial checksum without adding pseudo headers
  */
-static inline unsigned int
-csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum sum)
 {
 	__asm__(
 	"adds	%0, %1, %1, lsl #16	@ csum_fold		\n\
@@ -93,21 +84,25 @@ csum_fold(unsigned int sum)
 	: "=r" (sum)
 	: "r" (sum)
 	: "cc");
-	return (~sum) >> 16;
+	return (__force __sum16)(~(__force u32)sum >> 16);
 }
 
-static inline unsigned int
-csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
-		   unsigned int proto, unsigned int sum)
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+		   unsigned short proto, __wsum sum)
 {
 	__asm__(
 	"adds	%0, %1, %2		@ csum_tcpudp_nofold	\n\
-	adcs	%0, %0, %3					\n\
-	adcs	%0, %0, %4					\n\
-	adcs	%0, %0, %5					\n\
+	adcs	%0, %0, %3					\n"
+#ifdef __ARMEB__
+	"adcs	%0, %0, %4					\n"
+#else
+	"adcs	%0, %0, %4, lsl #8				\n"
+#endif
+	"adcs	%0, %0, %5					\n\
 	adc	%0, %0, #0"
 	: "=&r"(sum)
-	: "r" (sum), "r" (daddr), "r" (saddr), "r" (ntohs(len)), "Ir" (ntohs(proto))
+	: "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
 	: "cc");
 	return sum;
 }	
@@ -115,23 +110,27 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
  * 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, unsigned short len,
-		  unsigned int proto, unsigned int sum)
+static inline __sum16
+csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
+		  unsigned short proto, __wsum sum)
 {
 	__asm__(
 	"adds	%0, %1, %2		@ csum_tcpudp_magic	\n\
-	adcs	%0, %0, %3					\n\
-	adcs	%0, %0, %4					\n\
-	adcs	%0, %0, %5					\n\
+	adcs	%0, %0, %3					\n"
+#ifdef __ARMEB__
+	"adcs	%0, %0, %4					\n"
+#else
+	"adcs	%0, %0, %4, lsl #8				\n"
+#endif
+	"adcs	%0, %0, %5					\n\
 	adc	%0, %0, #0					\n\
 	adds	%0, %0, %0, lsl #16				\n\
 	addcs	%0, %0, #0x10000				\n\
 	mvn	%0, %0"
 	: "=&r"(sum)
-	: "r" (sum), "r" (daddr), "r" (saddr), "r" (ntohs(len)), "Ir" (ntohs(proto))
+	: "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
 	: "cc");
-	return sum >> 16;
+	return (__force __sum16)((__force u32)sum >> 16);
 }
 
 
@@ -139,20 +138,20 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
  * 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));
 }
 
 #define _HAVE_ARCH_IPV6_CSUM
-extern unsigned long
-__csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, __u32 len,
-		__u32 proto, unsigned int sum);
+extern __wsum
+__csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, __be32 len,
+		__be32 proto, __wsum sum);
 
-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)
 {
 	return csum_fold(__csum_ipv6_magic(saddr, daddr, htonl(len),
 					   htonl(proto), sum));