diff mbox series

[v4,3/3] io_uring: Remove unnecessary BUILD_BUG_ON

Message ID 20230504121856.904491-4-leitao@debian.org (mailing list archive)
State New, archived
Headers show
Series io_uring: Pass the whole sqe to commands | expand

Commit Message

Breno Leitao May 4, 2023, 12:18 p.m. UTC
In the io_uring_cmd_prep_async() there is an unnecessary compilation time
check to check if cmd is correctly placed at field 48 of the SQE.

This is unnecessary, since this check is already in place at
io_uring_init():

          BUILD_BUG_SQE_ELEM(48, __u64,  addr3);

Remove it and the uring_cmd_pdu_size() function, which is not used
anymore.

Keith started a discussion about this topic in the following thread:
Link: https://lore.kernel.org/lkml/ZDBmQOhbyU0iLhMw@kbusch-mbp.dhcp.thefacebook.com/

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 io_uring/uring_cmd.c | 3 ---
 io_uring/uring_cmd.h | 8 --------
 2 files changed, 11 deletions(-)

Comments

Ming Lei May 4, 2023, 2:40 p.m. UTC | #1
On Thu, May 04, 2023 at 05:18:56AM -0700, Breno Leitao wrote:
> In the io_uring_cmd_prep_async() there is an unnecessary compilation time
> check to check if cmd is correctly placed at field 48 of the SQE.
> 
> This is unnecessary, since this check is already in place at
> io_uring_init():
> 
>           BUILD_BUG_SQE_ELEM(48, __u64,  addr3);
> 
> Remove it and the uring_cmd_pdu_size() function, which is not used
> anymore.
> 
> Keith started a discussion about this topic in the following thread:
> Link: https://lore.kernel.org/lkml/ZDBmQOhbyU0iLhMw@kbusch-mbp.dhcp.thefacebook.com/
> 
> Signed-off-by: Breno Leitao <leitao@debian.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Ming Lei <ming.lei@redhat.com>

Thanks,
Ming
diff mbox series

Patch

diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index ed536d7499db..5e32db48696d 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -70,9 +70,6 @@  int io_uring_cmd_prep_async(struct io_kiocb *req)
 {
 	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
 
-	BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
-	BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
-
 	memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx));
 	ioucmd->sqe = req->async_data;
 	return 0;
diff --git a/io_uring/uring_cmd.h b/io_uring/uring_cmd.h
index 7c6697d13cb2..8117684ec3ca 100644
--- a/io_uring/uring_cmd.h
+++ b/io_uring/uring_cmd.h
@@ -3,11 +3,3 @@ 
 int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags);
 int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
 int io_uring_cmd_prep_async(struct io_kiocb *req);
-
-/*
- * The URING_CMD payload starts at 'cmd' in the first sqe, and continues into
- * the following sqe if SQE128 is used.
- */
-#define uring_cmd_pdu_size(is_sqe128)				\
-	((1 + !!(is_sqe128)) * sizeof(struct io_uring_sqe) -	\
-		offsetof(struct io_uring_sqe, cmd))