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btrfs: add comments to barriers before waitqueue_active

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Reduce number of undocumented barriers out there.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2015-02-16 19:36:47 +01:00
parent 33a9eca7e4
commit a83342aa0c
5 changed files with 16 additions and 2 deletions
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3
fs/btrfs/extent-tree.c
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@@ -10363,8 +10363,7 @@ void btrfs_end_write_no_snapshoting(struct btrfs_root *root)
{
percpu_counter_dec(&root->subv_writers->counter);
/*
* Make sure counter is updated before we wake up
* waiters.
* Make sure counter is updated before we wake up waiters.
*/
smp_mb();
if (waitqueue_active(&root->subv_writers->wait))