block: better packing for struct request

Keep the 32-bit CPU and cmd_type flags together to avoid holes on 64-bit
architectures.

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

1 files changed, 2 insertions, 3 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0c9f8793c87e..9746d223494c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -96,12 +96,11 @@ struct request {
         struct request_queue *q;
         struct blk_mq_ctx *mq_ctx;
 
-        u64 cmd_flags;
+        int cpu;
         unsigned cmd_type;
+        u64 cmd_flags;
         unsigned long atomic_flags;
 
-        int cpu;
-
         /* the following two fields are internal, NEVER access directly */
         unsigned int __data_len;        /* total data len */
         sector_t __sector;              /* sector cursor */