netdev - [PATCH net-next] tcp: align tcp_sock_write

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Message-ID: <20240301171945.2958176-1-edumazet@google.com>
Date: Fri,  1 Mar 2024 17:19:45 +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: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, Stephen Rothwell <sfr@...b.auug.org.au>, 
	kernel test robot <lkp@...el.com>
Subject: [PATCH net-next] tcp: align tcp_sock_write_rx group

Stephen Rothwell and kernel test robot reported that some arches
(parisc, hexagon) and/or compilers would not like blamed commit.

Lets make sure tcp_sock_write_rx group does not start with a hole.

While we are at it, correct tcp_sock_write_tx CACHELINE_ASSERT_GROUP_SIZE()
since after the blamed commit, we went to 105 bytes.

Fixes: 99123622050f ("tcp: remove some holes in struct tcp_sock")
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/netdev/20240301121108.5d39e4f9@canb.auug.org.au/
Closes: https://lore.kernel.org/oe-kbuild-all/202403011451.csPYOS3C-lkp@intel.com/
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/tcp.h | 2 +-
 net/ipv4/tcp.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 988a30ef6bfe956fa573f1f18c8284aa382dc1cc..55399ee2a57e736b55ed067fc06ea620bbe62fd3 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -304,7 +304,7 @@ struct tcp_sock {
 	__cacheline_group_end(tcp_sock_write_txrx);
 
 	/* RX read-write hotpath cache lines */
-	__cacheline_group_begin(tcp_sock_write_rx);
+	__cacheline_group_begin(tcp_sock_write_rx) __aligned(8);
 	u64	bytes_received;
 				/* RFC4898 tcpEStatsAppHCThruOctetsReceived
 				 * sum(delta(rcv_nxt)), or how many bytes
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c82dc42f57c65df112f79080ff407cd98d11ce68..7e1b848398d04f2da2a91c3af97b1e2e3895b8ee 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4651,7 +4651,7 @@ static void __init tcp_struct_check(void)
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_tx, tsorted_sent_queue);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_tx, highest_sack);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_tx, ecn_flags);
-	CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_tx, 113);
+	CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_tx, 105);
 
 	/* TXRX read-write hotpath cache lines */
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_txrx, pred_flags);
-- 
2.44.0.278.ge034bb2e1d-goog