blk-mq: initialize struct request fields individually

This allows us to avoid a non-atomic memset over ->atomic_flags as well
as killing lots of duplicate initializations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 20b26d4e53a2..94b27210641b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -90,9 +90,10 @@ enum rq_cmd_type_bits {
 #define BLK_MAX_CDB     16
 
 /*
- * try to put the fields that are referenced together in the same cacheline.
- * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init()
- * as well!
+ * Try to put the fields that are referenced together in the same cacheline.
+ *
+ * If you modify this structure, make sure to update blk_rq_init() and
+ * especially blk_mq_rq_ctx_init() to take care of the added fields.
  */
 struct request {
         struct list_head queuelist;