btrfs: Remove redundant memory barrier in dev stats

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As per atomic_t.txt documentation :
 - RMW operations that have a return value are fully ordered;

atomic_xchg is one such operation so it already includes everything it
needs w.r.t memory ordering and add a comment to be more explicit about
that.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Nikolay Borisov 2017-10-20 18:10:58 +03:00 • committed by David Sterba

parent 9deae96892

commit 4660c49f9b

1 changed files with 7 additions and 1 deletions

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8

fs/btrfs/volumes.h

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