null-blk: save memory footprint for struct nullb_cmd

Total 16 bytes can be saved in two ways:

1) The field 'bio' will only be used in bio based mode, and the field
   'rq' will only be used in mq mode. Since they won't be used in the
   same time, declare a union for them.
2) The field 'bool fake_timeout' can be placed in the hole after the
   field 'error'.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20220426022133.3999006-1-yukuai3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h
index 78eb56b..4525a65 100644 (file)
--- a/drivers/block/null_blk/null_blk.h
+++ b/drivers/block/null_blk/null_blk.h
@@ -16,13 +16,15 @@
 #include <linux/mutex.h>
 
 struct nullb_cmd {
-       struct request *rq;
-       struct bio *bio;
+       union {
+               struct request *rq;
+               struct bio *bio;
+       };
        unsigned int tag;
        blk_status_t error;
+       bool fake_timeout;
        struct nullb_queue *nq;
        struct hrtimer timer;
-       bool fake_timeout;
 };
 
 struct nullb_queue {