linux-kernel - [PATCH net-next v2 1/2] net: pass const to msg_data

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Message-Id: <20250407-tcpsendmsg-v2-1-9f0ea843ef99@debian.org>
Date: Mon, 07 Apr 2025 06:40:43 -0700
From: Breno Leitao <leitao@...ian.org>
To: David Ahern <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, 
 Neal Cardwell <ncardwell@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 Masami Hiramatsu <mhiramat@...nel.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>
Cc: Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, 
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-trace-kernel@...r.kernel.org, Breno Leitao <leitao@...ian.org>, 
 kernel-team@...a.com
Subject: [PATCH net-next v2 1/2] net: pass const to msg_data_left()

The msg_data_left() function doesn't modify the struct msghdr parameter,
so mark it as const. This allows the function to be used with const
references, improving type safety and making the API more flexible.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 include/linux/socket.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/socket.h b/include/linux/socket.h
index c3322eb3d6865..3b262487ec060 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -168,7 +168,7 @@ static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr
 	return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
 }

-static inline size_t msg_data_left(struct msghdr *msg)
+static inline size_t msg_data_left(const struct msghdr *msg)
 {
 	return iov_iter_count(&msg->msg_iter);
 }

-- 
2.47.1