We don't need full ints for several of these members. Change the
page_order and nr_entries to unsigned shorts, and the true/false from_user
and null_mapped to booleans.
This shrinks the struct from 32 to 24 bytes on 64-bit archs.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
block/blk-map.c | 2 +-
include/linux/blk-mq.h | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/block/blk-map.c b/block/blk-map.c
index df8b066cd548..4043c5809cd4 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -158,7 +158,7 @@ static int bio_copy_user_iov(struct request *rq, struct rq_map_data *map_data,
bio_init(bio, NULL, bio->bi_inline_vecs, nr_pages, req_op(rq));
if (map_data) {
- nr_pages = 1 << map_data->page_order;
+ nr_pages = 1U << map_data->page_order;
i = map_data->offset / PAGE_SIZE;
}
while (len) {
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index effee1dc715a..1f21590439d4 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -964,11 +964,11 @@ blk_status_t blk_insert_cloned_request(struct request *rq);
struct rq_map_data {
struct page **pages;
- int page_order;
- int nr_entries;
unsigned long offset;
- int null_mapped;
- int from_user;
+ unsigned short page_order;
+ unsigned short nr_entries;
+ bool null_mapped;
+ bool from_user;
};
int blk_rq_map_user(struct request_queue *, struct request *,
--
2.35.1
