| commit | fc13457f74dcf054b0d17efb7b94b46fdf17f412 | [log] [tgz] |
|---|---|---|
| author | Jens Axboe <axboe@kernel.dk> | Wed Oct 04 11:22:24 2017 -0600 |
| committer | Jens Axboe <axboe@kernel.dk> | Wed Oct 04 11:22:24 2017 -0600 |
| tree | b7a6a14246cf9e9c9967c7072d96a0010d117164 | |
| parent | a7af0af32171c17d881e3e58b0925c4a44fb5a42 [diff] |
blk-mq: document the need to have STARTED and COMPLETED share a byte For memory ordering guarantees on stores, we need to ensure that these two bits share the same byte of storage in the unsigned long. Add a comment as to why, and a BUILD_BUG_ON() to ensure that we don't violate this requirement. Suggested-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>