[PATCH 4/4] io_uring/net: clean up io_msg_copy_hdr

[Pavel Begunkov <asml.silence@xxxxxxxxx>]

Put sr->umsg into a local variable, so it doesn't repeat "sr->umsg->"
for every field. It looks nicer, and likely without the patch it
compiles into a bunch of umsg memory reads.

Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
 io_uring/net.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index 7ff2cb771e1f..ccdbb3c42ac0 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -261,6 +261,7 @@ static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg,
 			   struct user_msghdr *msg, int ddir)
 {
 	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+	struct user_msghdr __user *umsg = sr->umsg;
 	struct iovec *iov;
 	int ret, nr_segs;
 
@@ -272,16 +273,16 @@ static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg,
 		nr_segs = 1;
 	}
 
-	if (!user_access_begin(sr->umsg, sizeof(*sr->umsg)))
+	if (!user_access_begin(umsg, sizeof(*umsg)))
 		return -EFAULT;
 
 	ret = -EFAULT;
-	unsafe_get_user(msg->msg_name, &sr->umsg->msg_name, ua_end);
-	unsafe_get_user(msg->msg_namelen, &sr->umsg->msg_namelen, ua_end);
-	unsafe_get_user(msg->msg_iov, &sr->umsg->msg_iov, ua_end);
-	unsafe_get_user(msg->msg_iovlen, &sr->umsg->msg_iovlen, ua_end);
-	unsafe_get_user(msg->msg_control, &sr->umsg->msg_control, ua_end);
-	unsafe_get_user(msg->msg_controllen, &sr->umsg->msg_controllen, ua_end);
+	unsafe_get_user(msg->msg_name, &umsg->msg_name, ua_end);
+	unsafe_get_user(msg->msg_namelen, &umsg->msg_namelen, ua_end);
+	unsafe_get_user(msg->msg_iov, &umsg->msg_iov, ua_end);
+	unsafe_get_user(msg->msg_iovlen, &umsg->msg_iovlen, ua_end);
+	unsafe_get_user(msg->msg_control, &umsg->msg_control, ua_end);
+	unsafe_get_user(msg->msg_controllen, &umsg->msg_controllen, ua_end);
 	msg->msg_flags = 0;
 
 	if (req->flags & REQ_F_BUFFER_SELECT) {
-- 
2.46.0