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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-08 20:02:31 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-08 20:02:31 -0800 |
| commit | dde86f41f4cb13015288abcff4706993c007f65d (patch) | |
| tree | 2e981cfa9eca8bddd5dcef63957f677ad2f7b15b /include/linux/math64.h | |
| parent | 3b2c67de4650a725654cf9bf36e0025ca10442cd (diff) | |
| parent | 802eee95bde72fd0cd0f3a5b2098375a487d1eda (diff) | |
Merge v3.13-rc6 into char-misc-next
We want these fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/math64.h')
| -rw-r--r-- | include/linux/math64.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/math64.h b/include/linux/math64.h index 69ed5f5e9f6e..c45c089bfdac 100644 --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -133,4 +133,34 @@ __iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder) return ret; } +#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__) + +#ifndef mul_u64_u32_shr +static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift) +{ + return (u64)(((unsigned __int128)a * mul) >> shift); +} +#endif /* mul_u64_u32_shr */ + +#else + +#ifndef mul_u64_u32_shr +static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift) +{ + u32 ah, al; + u64 ret; + + al = a; + ah = a >> 32; + + ret = ((u64)al * mul) >> shift; + if (ah) + ret += ((u64)ah * mul) << (32 - shift); + + return ret; +} +#endif /* mul_u64_u32_shr */ + +#endif + #endif /* _LINUX_MATH64_H */ |