diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-04-09 14:09:14 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-04-10 18:55:05 -0700 |
| commit | 9b9fd45869e744bea7d32a94793736e3d9fd7d26 (patch) | |
| tree | 70a8f0792595434743632a7bad4c3a94525e395f /net/ipv4 | |
| parent | 414e576fb08f108b061cbc1fb964e51ff3467985 (diff) | |
tcp: tweak tcp_sock_write_txrx size assertion
I forgot 32bit arches might have 64bit alignment for u64
fields.
tcp_sock_write_txrx group does not contain pointers,
but two u64 fields. It is possible that on 32bit kernel,
a 32bit hole is before tp->tcp_clock_cache.
I will try to remember a group can be bigger on 32bit
kernels in the future.
With help from Vladimir Oltean.
Fixes: d2c3a7eb1afa ("tcp: more struct tcp_sock adjustments")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202404082207.HCEdQhUO-lkp@intel.com/
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20240409140914.4105429-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index b07aa71b24ec..e1bf468e0d22 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4673,7 +4673,11 @@ static void __init tcp_struct_check(void) CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_txrx, app_limited); CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_txrx, rcv_wnd); CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_txrx, rx_opt); - CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_txrx, 92); + + /* 32bit arches with 8byte alignment on u64 fields might need padding + * before tcp_clock_cache. + */ + CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_txrx, 92 + 4); /* RX read-write hotpath cache lines */ CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_write_rx, bytes_received); |