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net: remove addr_len argument of recvmsg() handlers

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Use msg->msg_namelen as a place holder instead of a
temporary variable, notably in inet[6]_recvmsg().

This removes stack canaries and allows tail-calls.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux
add/remove: 0/0 grow/shrink: 2/19 up/down: 26/-532 (-506)
Function                                     old     new   delta
rawv6_recvmsg                                744     767     +23
vsock_dgram_recvmsg                           55      58      +3
vsock_connectible_recvmsg                     50      47      -3
unix_stream_recvmsg                          161     158      -3
unix_seqpacket_recvmsg                        62      59      -3
unix_dgram_recvmsg                            42      39      -3
tcp_recvmsg                                  546     543      -3
mptcp_recvmsg                               1568    1565      -3
ping_recvmsg                                 806     800      -6
tcp_bpf_recvmsg_parser                       983     974      -9
ip_recv_error                                588     576     -12
ipv6_recv_rxpmtu                             442     428     -14
udp_recvmsg                                 1243    1224     -19
ipv6_recv_error                             1046    1024     -22
udpv6_recvmsg                               1487    1461     -26
raw_recvmsg                                  465     437     -28
udp_bpf_recvmsg                             1027     984     -43
sock_common_recvmsg                          103      27     -76
inet_recvmsg                                 257     175     -82
inet6_recvmsg                                257     175     -82
tcp_bpf_recvmsg                              663     568     -95
Total: Before=25143834, After=25143328, chg -0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260227151120.1346573-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-02-27 15:11:20 +00:00
committed by Jakub Kicinski
parent f5ada26d6c
commit 8341c989ac
39 changed files with 99 additions and 127 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
net/unix/af_unix.c
View File

@@ -2665,7 +2665,7 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg, size_t si
const struct proto *prot = READ_ONCE(sk->sk_prot);
if (prot != &unix_dgram_proto)
return prot->recvmsg(sk, msg, size, flags, NULL);
return prot->recvmsg(sk, msg, size, flags);
#endif
return __unix_dgram_recvmsg(sk, msg, size, flags);
}
@@ -3139,7 +3139,7 @@ static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg,
const struct proto *prot = READ_ONCE(sk->sk_prot);
if (prot != &unix_stream_proto)
return prot->recvmsg(sk, msg, size, flags, NULL);
return prot->recvmsg(sk, msg, size, flags);
#endif
return unix_stream_read_generic(&state, true);
}