linux-kernel - [PATCH] target/file: don't zero iter before iov_iter

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Message-Id: <34cd22d6cec046e3adf402accb1453cc255b9042.1610207523.git.asml.silence@gmail.com>
Date:   Sat,  9 Jan 2021 15:53:27 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] target/file: don't zero iter before iov_iter_bvec

iov_iter_bvec() initialises iterators well, no need to pre-zero it
beforehand as done in fd_execute_rw_aio(). Compilers can't optimise it
out and generate extra code for that (confirmed with assembly).

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 drivers/target/target_core_file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index cce455929778..5a66854def95 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -267,7 +267,7 @@ fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 	struct fd_dev *fd_dev = FD_DEV(dev);
 	struct file *file = fd_dev->fd_file;
 	struct target_core_file_cmd *aio_cmd;
-	struct iov_iter iter = {};
+	struct iov_iter iter;
 	struct scatterlist *sg;
 	ssize_t len = 0;
 	int ret = 0, i;
-- 
2.24.0