diff options
| author | Mark Brown <broonie@kernel.org> | 2014-10-20 17:55:07 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-10-20 18:27:32 +0100 |
| commit | b7a40242c82cd73cfcea305f23e67d068dd8401a (patch) | |
| tree | 251b49d19cd7c371847ae1f951e1b537ca0e1c15 /include/linux/hash.h | |
| parent | d26833bfce5e56017bea9f1f50838f20e18e7b7e (diff) | |
| parent | 9c6de47d53a3ce8df1642ae67823688eb98a190a (diff) | |
Merge branch 'fix/dw' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-dw
Conflicts:
drivers/spi/spi-dw-mid.c
Diffstat (limited to 'include/linux/hash.h')
| -rw-r--r-- | include/linux/hash.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/hash.h b/include/linux/hash.h index bd1754c7ecef..d0494c399392 100644 --- a/include/linux/hash.h +++ b/include/linux/hash.h @@ -37,6 +37,9 @@ static __always_inline u64 hash_64(u64 val, unsigned int bits) { u64 hash = val; +#if defined(CONFIG_ARCH_HAS_FAST_MULTIPLIER) && BITS_PER_LONG == 64 + hash = hash * GOLDEN_RATIO_PRIME_64; +#else /* Sigh, gcc can't optimise this alone like it does for 32 bits. */ u64 n = hash; n <<= 18; @@ -51,6 +54,7 @@ static __always_inline u64 hash_64(u64 val, unsigned int bits) hash += n; n <<= 2; hash += n; +#endif /* High bits are more random, so use them. */ return hash >> (64 - bits); |