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blk-mq: document the need to have STARTED and COMPLETED share a byte
authorJens Axboe <axboe@kernel.dk>
Wed, 4 Oct 2017 17:22:24 +0000 (11:22 -0600)
committerJens Axboe <axboe@kernel.dk>
Wed, 4 Oct 2017 17:22:24 +0000 (11:22 -0600)
commitfc13457f74dcf054b0d17efb7b94b46fdf17f412
treeb7a6a14246cf9e9c9967c7072d96a0010d117164tree | snapshot
parenta7af0af32171c17d881e3e58b0925c4a44fb5a42commit | 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>
block/blk-mq.c diff | blob | history
block/blk.h diff | blob | history
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