Reduce number of standalone barriers before waitqueue_active calls.

Changes v2:
* add 2 barriers to btrfs_sync_log and do not assume they're implied,
  (pointed out by Nikolay)

git://github.com/kdave/btrfs-devel.git cleanup/cond-wake

David Sterba (3):
  btrfs: introduce conditional wakeup helpers
  btrfs: add barriers to btrfs_sync_log before log_commit_wait wakeups
  btrfs: replace waitqueue_actvie with cond_wake_up

 fs/btrfs/compression.c   |  7 +------
 fs/btrfs/ctree.h         | 22 ++++++++++++++++++++++
 fs/btrfs/delayed-inode.c |  9 +++------
 fs/btrfs/dev-replace.c   | 10 ++++------
 fs/btrfs/extent-tree.c   |  7 +------
 fs/btrfs/inode.c         |  9 +++------
 fs/btrfs/locking.c       | 34 +++++++++++-----------------------
 fs/btrfs/ordered-data.c  | 14 ++++----------
 fs/btrfs/transaction.c   |  7 +------
 fs/btrfs/tree-log.c      | 29 +++++++++++++----------------
 10 files changed, 63 insertions(+), 85 deletions(-)

-- 
2.16.2

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