io_uring: Remove unnecessary BUILD_BUG_ON

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/[email protected]/ Signed-off-by: Breno Leitao <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: Pavel Begunkov <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
wafgo · May 4, 2023 · d2b7fa6 · d2b7fa6
1 parent fd9b854
commit d2b7fa6
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diff --git 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
@@ -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))