diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2012-07-25 14:33:45 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-07-25 14:35:04 +0200 |
| commit | 8cef081c71dd4e16a01a1e63cedab21eef8b5735 (patch) | |
| tree | b5b0fb5ab09dc60dee5fc8fd8e980359abbd1b1e /arch/tile/include/asm/checksum.h | |
| parent | 3d55c29fb24286f350f04021bef2dd799e25dd20 (diff) | |
| parent | 9161c3b796a2841a9a7be3d9c9dd121269ce90e8 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into fixes
The merge of the 'clk-for-linus' branch caused an automated
merge failure. Pull that in here so we can fix the problem.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/tile/include/asm/checksum.h')
| -rw-r--r-- | arch/tile/include/asm/checksum.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/tile/include/asm/checksum.h b/arch/tile/include/asm/checksum.h index a120766c726..b21a2fdec9f 100644 --- a/arch/tile/include/asm/checksum.h +++ b/arch/tile/include/asm/checksum.h @@ -21,4 +21,22 @@ __wsum do_csum(const unsigned char *buff, int len); #define do_csum do_csum +/* + * Return the sum of all the 16-bit subwords in a long. + * This sums two subwords on a 32-bit machine, and four on 64 bits. + * The implementation does two vector adds to capture any overflow. + */ +static inline unsigned int csum_long(unsigned long x) +{ + unsigned long ret; +#ifdef __tilegx__ + ret = __insn_v2sadu(x, 0); + ret = __insn_v2sadu(ret, 0); +#else + ret = __insn_sadh_u(x, 0); + ret = __insn_sadh_u(ret, 0); +#endif + return ret; +} + #endif /* _ASM_TILE_CHECKSUM_H */ |