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| author | Ingo Molnar <mingo@kernel.org> | 2014-01-12 20:56:29 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-01-12 20:56:29 +0400 |
| commit | da4540757d35a98a350d6e8d882a64b2d04f8581 (patch) | |
| tree | ad77d8752f5db40497c819f051cbae12effb8163 /include/linux/math64.h | |
| parent | cc131eef1cec905b9bdb0be6d7ab3af86f23de98 (diff) | |
| parent | 7e22e91102c6b9df7c4ae2168910e19d2bb14cd6 (diff) | |
| download | linux-da4540757d35a98a350d6e8d882a64b2d04f8581.tar.xz | |
Merge tag 'v3.13-rc8' into x86/ras, to pick up fixes.
Signed-off-by: Ingo Molnar <mingo@kernel.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 */ |