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[Blackfin] arch: Blackfin checksum annotations 

FSVOtest in this case, since I don't have the hardware...
However, all changes seen by gcc are actually
 - explicit cast to unsigned short in return expression of functions
    returning unsigned short
 - csum_fold() return type changed from unsigned int to __sum16
   (unsigned short), same as for all other architecture and as net/* expects;
   expression actually returned is ((~(sum << 16)) >> 16) with sum being
   unsigned 32bit, so it's (a) going to fit into the range of unsigned short
   and (b) had been unsigned all along, so no sign expansion mess happened.

Tested-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Miller <davem@davemloft.net>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Al Viro 2008-05-12 11:55:10 +08:00 committed by Bryan Wu
parent b8291ad07a
commit 45b3947c2d
2 changed files with 24 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/blackfin/lib/checksum.c
View File

@ -72,9 +72,9 @@ static unsigned short do_csum(const unsigned char *buff, int len)
* This is a version of ip_compute_csum() optimized for IP headers, * This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries. * which always checksum on 4 octet boundaries.
*/ */
unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl) __sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl)
{ {
return ~do_csum(iph, ihl * 4); return (__force __sum16)~do_csum(iph, ihl * 4);
} }
/* /*
@ -89,7 +89,7 @@ unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
* *
* it's best to have buff aligned on a 32-bit boundary * 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)
{ {
/* /*
* Just in case we get nasty checksum data... * Just in case we get nasty checksum data...
@ -109,22 +109,22 @@ unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum)
* this routine is used for miscellaneous IP-like checksums, mainly * this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c * in icmp.c
*/ */
unsigned short ip_compute_csum(const 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);
} }
/* /*
* copy from fs while checksumming, otherwise like csum_partial * copy from fs while checksumming, otherwise like csum_partial
*/ */
unsigned int __wsum
csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst, csum_partial_copy_from_user(const void __user *src, void *dst,
int len, int sum, int *csum_err) int len, __wsum sum, int *csum_err)
{ {
if (csum_err) if (csum_err)
*csum_err = 0; *csum_err = 0;
memcpy(dst, src, len); memcpy(dst, (__force void *)src, len);
return csum_partial(dst, len, sum); return csum_partial(dst, len, sum);
} }
@ -132,8 +132,7 @@ csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst,
* copy from ds while checksumming, otherwise like csum_partial * copy from ds while checksumming, otherwise like csum_partial
*/ */
unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst, __wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum)
int len, int sum)
{ {
memcpy(dst, src, len); memcpy(dst, src, len);
return csum_partial(dst, len, sum); return csum_partial(dst, len, sum);

29
include/asm-blackfin/checksum.h
View File

@ -15,7 +15,7 @@
* *
* it's best to have buff aligned on a 32-bit boundary * 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 * the same as csum_partial, but copies from src while it
@ -25,8 +25,8 @@ unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);
* better 64-bit) boundary * better 64-bit) boundary
*/ */
unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst, __wsum csum_partial_copy(const void *src, void *dst,
int len, int sum); int len, __wsum sum);
/* /*
* the same as csum_partial_copy, but copies from user space. * the same as csum_partial_copy, but copies from user space.
@ -35,20 +35,19 @@ unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst,
* better 64-bit) boundary * better 64-bit) boundary
*/ */
extern unsigned int csum_partial_copy_from_user(const unsigned char *src, extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
unsigned char *dst, int len, int len, __wsum sum, int *csum_err);
int sum, int *csum_err);
#define csum_partial_copy_nocheck(src, dst, len, sum) \ #define csum_partial_copy_nocheck(src, dst, len, sum) \
csum_partial_copy((src), (dst), (len), (sum)) csum_partial_copy((src), (dst), (len), (sum))
unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl); __sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl);
/* /*
* Fold a partial checksum * Fold a partial checksum
*/ */
static inline unsigned int csum_fold(unsigned int sum) static inline __sum16 csum_fold(__wsum sum)
{ {
while (sum >> 16) while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16); sum = (sum & 0xffff) + (sum >> 16);
@ -60,9 +59,9 @@ static inline unsigned int csum_fold(unsigned int sum)
* returns a 16-bit checksum, already complemented * returns a 16-bit checksum, already complemented
*/ */
static inline unsigned int static inline __wsum
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, unsigned int sum) unsigned short proto, __wsum sum)
{ {
__asm__ ("%0 = %0 + %1;\n\t" __asm__ ("%0 = %0 + %1;\n\t"
@ -84,9 +83,9 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
return (sum); return (sum);
} }
static inline unsigned short int static inline __sum16
csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, unsigned int sum) unsigned short proto, __wsum sum)
{ {
return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
} }
@ -96,6 +95,6 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
* in icmp.c * in icmp.c
*/ */
extern unsigned short ip_compute_csum(const unsigned char *buff, int len); extern __sum16 ip_compute_csum(const void *buff, int len);
#endif /* _BFIN_CHECKSUM_H */ #endif /* _BFIN_CHECKSUM_H */