netdev - [PATCH net-next 1/3] tcp: mark tcp_process_tlp

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Message-ID: <20260127032147.3498272-2-edumazet@google.com>
Date: Tue, 27 Jan 2026 03:21:45 +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>, 
	Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 1/3] tcp: mark tcp_process_tlp_ack() as unlikely

It is unlikely we have to call tcp_process_tlp_ack().

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/tcp_input.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 9e91ddbc6253..f2fafba95705 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4283,7 +4283,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 
 	tcp_in_ack_event(sk, flag);
 
-	if (tp->tlp_high_seq)
+	if (unlikely(tp->tlp_high_seq))
 		tcp_process_tlp_ack(sk, ack, flag);
 
 	if (tcp_ack_is_dubious(sk, flag)) {
@@ -4333,7 +4333,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	 */
 	tcp_ack_probe(sk);
 
-	if (tp->tlp_high_seq)
+	if (unlikely(tp->tlp_high_seq))
 		tcp_process_tlp_ack(sk, ack, flag);
 	return 1;
 
-- 
2.53.0.rc1.217.geba53bf80e-goog