diff options
| author | David Woodhouse <dwmw2@infradead.org> | 2007-04-27 19:16:19 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-04-27 19:16:19 +0100 |
| commit | d1da4e50e5d09f02c340927a4fcb7f54202fa033 (patch) | |
| tree | 7f98317bdd45dbdb7644e9179891c5af6a3a8ef1 /lib/div64.c | |
| parent | 78ab67da1002d954ea4c3e2b441e2483c41f94e8 (diff) | |
| parent | a205752d1ad2d37d6597aaae5a56fc396a770868 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
drivers/mtd/Kconfig
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'lib/div64.c')
| -rw-r--r-- | lib/div64.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/lib/div64.c b/lib/div64.c index 365719f8483..b71cf93c529 100644 --- a/lib/div64.c +++ b/lib/div64.c @@ -23,7 +23,7 @@ /* Not needed on 64bit architectures */ #if BITS_PER_LONG == 32 -uint32_t __div64_32(uint64_t *n, uint32_t base) +uint32_t __attribute__((weak)) __div64_32(uint64_t *n, uint32_t base) { uint64_t rem = *n; uint64_t b = base; @@ -58,4 +58,24 @@ uint32_t __div64_32(uint64_t *n, uint32_t base) EXPORT_SYMBOL(__div64_32); +/* 64bit divisor, dividend and result. dynamic precision */ +uint64_t div64_64(uint64_t dividend, uint64_t divisor) +{ + uint32_t high, d; + + high = divisor >> 32; + if (high) { + unsigned int shift = fls(high); + + d = divisor >> shift; + dividend >>= shift; + } else + d = divisor; + + do_div(dividend, d); + + return dividend; +} +EXPORT_SYMBOL(div64_64); + #endif /* BITS_PER_LONG == 32 */ |