Merge branch 'fix/waitqueue-barriers' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux into for-linus-4.4
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@@ -10372,8 +10372,7 @@ void btrfs_end_write_no_snapshoting(struct btrfs_root *root)
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{
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percpu_counter_dec(&root->subv_writers->counter);
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/*
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* Make sure counter is updated before we wake up
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* waiters.
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* Make sure counter is updated before we wake up waiters.
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*/
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smp_mb();
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if (waitqueue_active(&root->subv_writers->wait))
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