From: Eric Dumazet <edumazet@google.com>
Date: Wed, 27 Oct 2021 20:19:20 +0000 (-0700)
Subject: tcp: no longer set skb->reserved_tailroom
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f401da475f98c1840d48c9e00a6eb228237357c0;p=linux.git

tcp: no longer set skb->reserved_tailroom

TCP/MPTCP sendmsg() no longer puts payload in skb->head,
we can remove not needed code.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 68b946cfd4337..66ed0d79f4147 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -876,11 +876,6 @@ struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
 		}
 		if (likely(mem_scheduled)) {
 			skb_reserve(skb, MAX_TCP_HEADER);
-			/*
-			 * Make sure that we have exactly size bytes
-			 * available to the caller, no more, no less.
-			 */
-			skb->reserved_tailroom = skb->end - skb->tail - size;
 			INIT_LIST_HEAD(&skb->tcp_tsorted_anchor);
 			return skb;
 		}
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 10b336d218656..aa96d311bea0d 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1174,7 +1174,6 @@ static struct sk_buff *__mptcp_do_alloc_tx_skb(struct sock *sk, gfp_t gfp)
 	if (likely(skb)) {
 		if (likely(__mptcp_add_ext(skb, gfp))) {
 			skb_reserve(skb, MAX_TCP_HEADER);
-			skb->reserved_tailroom = skb->end - skb->tail;
 			INIT_LIST_HEAD(&skb->tcp_tsorted_anchor);
 			return skb;
 		}