netdev - [PATCH net-next 6/7] tcp: move mtu_info to remove two 32bit holes

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Message-ID: <20250918155532.751173-7-edumazet@google.com>
Date: Thu, 18 Sep 2025 15:55:31 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 6/7] tcp: move mtu_info to remove two 32bit holes

This removes 8bytes waste on 64bit builds.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/tcp.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 3f282130c863d07cddd931b85f43afaf44bc7323..20b8c6e21fef36984810541a06fcb7ba8f0c45b1 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -448,6 +448,9 @@ struct tcp_sock {
 				 * the first SYN. */
 	u32	undo_marker;	/* snd_una upon a new recovery episode. */
 	int	undo_retrans;	/* number of undoable retransmissions. */
+	u32	mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG
+			   * while socket was owned by user.
+			   */
 	u64	bytes_retrans;	/* RFC4898 tcpEStatsPerfOctetsRetrans
 				 * Total data bytes retransmitted
 				 */
@@ -494,9 +497,6 @@ struct tcp_sock {
 		u32		  probe_seq_end;
 	} mtu_probe;
 	u32     plb_rehash;     /* PLB-triggered rehash attempts */
-	u32	mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG
-			   * while socket was owned by user.
-			   */
 #if IS_ENABLED(CONFIG_MPTCP)
 	bool	is_mptcp;
 #endif
-- 
2.51.0.384.g4c02a37b29-goog