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| author | Tejun Heo <tj@kernel.org> | 2014-09-24 13:00:21 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-09-24 13:00:21 -0400 |
| commit | d06efebf0c37d438fcf07057be00dd40fcfce08d (patch) | |
| tree | 31a0786d132aadf4cbb9725f3f444ef6e1052128 /include/linux/hash.h | |
| parent | bb2e226b3bef596dd56be97df655d857b4603923 (diff) | |
| parent | 0a30288da1aec914e158c2d7a3482a85f632750f (diff) | |
| download | talos-obmc-linux-d06efebf0c37d438fcf07057be00dd40fcfce08d.tar.gz talos-obmc-linux-d06efebf0c37d438fcf07057be00dd40fcfce08d.zip | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block into for-3.18
This is to receive 0a30288da1ae ("blk-mq, percpu_ref: implement a
kludge for SCSI blk-mq stall during probe") which implements
__percpu_ref_kill_expedited() to work around SCSI blk-mq stall. The
commit reverted and patches to implement proper fix will be added.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>
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); |
