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author | Nikolay Borisov <nborisov@suse.com> | 2018-02-14 10:53:36 +0200 |
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committer | David Sterba <dsterba@suse.com> | 2018-03-26 15:09:40 +0200 |
commit | de224b7c56baa335bde9afcb4aa68f03c38f5f42 (patch) | |
tree | 638c272a174b666c8bd4b8c7cf836e3d53cdef19 /fs/btrfs/super.c | |
parent | 16db5758fef8c71b0353a7b5505496d6f9229820 (diff) |
btrfs: Remove redundant memory barriers around dio_private error status
Using any kind of memory barriers around atomic operations which have
a return value is redundant, since those operations themselves are
fully ordered. atomic_t.txt states:
- RMW operations that have a return value are fully ordered;
Fully ordered primitives are ordered against everything prior and
everything subsequent. Therefore a fully ordered primitive is like
having an smp_mb() before and an smp_mb() after the primitive.
Given this let's replace the extra memory barriers with comments.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/super.c')
0 files changed, 0 insertions, 0 deletions