[NET]: PARISC checksum annotations and cleanups.

* sanitized prototypes, annotated
* kill shift-by-16 in checksum calculation

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

1 files changed, 26 insertions, 29 deletions

diff --git a/include/asm-parisc/checksum.h b/include/asm-parisc/checksum.h
index 229cb56fdb7..cc3ec1bd891 100644
--- a/include/asm-parisc/checksum.h
+++ b/include/asm-parisc/checksum.h
@@ -15,7 +15,7 @@
  *
  * it's best to have buff aligned on a 32-bit boundary
  */
-extern unsigned int csum_partial(const unsigned char *, int, unsigned int);
+extern __wsum csum_partial(const void *, int, __wsum);
 
 /*
  * The same as csum_partial, but copies from src while it checksums.
@@ -23,15 +23,14 @@ extern unsigned int csum_partial(const unsigned char *, int, unsigned int);
  * Here even more important to align src and dst on a 32-bit (or even
  * better 64-bit) boundary
  */
-extern unsigned int csum_partial_copy_nocheck(const unsigned char *, unsigned char *,
-                                              int, unsigned int);
+extern __wsum csum_partial_copy_nocheck(const void *, void *, int, __wsum);
 
 /*
  * this is a new version of the above that records errors it finds in *errp,
  * but continues and zeros the rest of the buffer.
  */
-extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
-                unsigned char *dst, int len, unsigned int sum, int *errp);
+extern __wsum csum_partial_copy_from_user(const void __user *src,
+                void *dst, int len, __wsum sum, int *errp);
 
 /*
  *      Optimized for IP headers, which always checksum on 4 octet boundaries.
@@ -39,11 +38,10 @@ extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
  *      Written by Randolph Chung <tausq@debian.org>, and then mucked with by
  *      LaMont Jones <lamont@debian.org>
  */
-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;
 
-
         __asm__ __volatile__ (
 "       ldws,ma         4(%1), %0\n"
 "       addib,<=        -4, %2, 2f\n"
@@ -69,27 +67,27 @@ static inline unsigned short ip_fast_csum(unsigned char * iph,
         : "1" (iph), "2" (ihl)
         : "r19", "r20", "r21" );
 
-        return(sum);
+        return (__force __sum16)sum;
 }
 
 /*
  *      Fold a partial checksum
  */
-static inline unsigned int csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum csum)
 {
+        u32 sum = (__force u32)csum;
         /* add the swapped two 16-bit halves of sum,
            a possible carry from adding the two 16-bit halves,
            will carry from the lower half into the upper half,
            giving us the correct sum in the upper half. */
         sum += (sum << 16) + (sum >> 16);
-        return (~sum) >> 16;
+        return (__force __sum16)(~sum >> 16);
 }
  
-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)
 {
         __asm__(
         "       add  %1, %0, %0\n"
@@ -97,19 +95,18 @@ static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
         "       addc %3, %0, %0\n"
         "       addc %%r0, %0, %0\n"
                 : "=r" (sum)
-                : "r" (daddr), "r"(saddr), "r"((proto<<16)+len), "0"(sum));
-    return sum;
+                : "r" (daddr), "r"(saddr), "r"(proto+len), "0"(sum));
+        return 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));
 }
@@ -118,17 +115,17 @@ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
  * this routine is used for miscellaneous IP-like checksums, mainly
  * in icmp.c
  */
-static inline unsigned short ip_compute_csum(unsigned char * buf, int len) {
+static inline __sum16 ip_compute_csum(const void *buf, int len)
+{
          return csum_fold (csum_partial(buf, len, 0));
 }
 
 
 #define _HAVE_ARCH_IPV6_CSUM
-static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
-                                                     struct in6_addr *daddr,
-                                                     __u16 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)
 {
         __asm__ __volatile__ (
 
@@ -193,9 +190,9 @@ 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)
 {
         /* code stolen from include/asm-mips64 */
@@ -203,7 +200,7 @@ static __inline__ unsigned int csum_and_copy_to_user (const unsigned char *src,
          
         if (copy_to_user(dst, src, len)) {
                 *err_ptr = -EFAULT;
-                return -1;
+                return (__force __wsum)-1;
         }
 
         return sum;