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| author |   Jens Axboe <axboe@kernel.dk> | 2017-10-04 11:22:24 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-10-04 11:22:24 -0600 |
| commit | fc13457f74dcf054b0d17efb7b94b46fdf17f412 (patch) | |
| tree | b7a6a14246cf9e9c9967c7072d96a0010d117164 /fs/fs-writeback.c | |
| parent | blk-mq: attempt to fix atomic flag memory ordering (diff) | |
| download | linux-dev-fc13457f74dcf054b0d17efb7b94b46fdf17f412.tar.xz linux-dev-fc13457f74dcf054b0d17efb7b94b46fdf17f412.zip | |
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>
Diffstat (limited to 'fs/fs-writeback.c')
0 files changed, 0 insertions, 0 deletions