--- /dev/null
+From k@mgml.me Fri Oct 3 14:56:36 2025
+From: Kenta Akagi <k@mgml.me>
+Date: Thu, 2 Oct 2025 23:17:59 +0900
+Subject: selftests: mptcp: connect: fix build regression caused by backport
+To: gregkh@linuxfoundation.org, sashal@kernel.org
+Cc: stable@vger.kernel.org, MPTCP Upstream <mptcp@lists.linux.dev>, Kenta Akagi <k@mgml.me>
+Message-ID: <20251002141759.76891-1-k@mgml.me>
+
+From: Kenta Akagi <k@mgml.me>
+
+Since v6.1.154, mptcp selftests have failed to build with the following
+errors:
+
+mptcp_connect.c: In function ‘main_loop_s’:
+mptcp_connect.c:1040:59: error: ‘winfo’ undeclared (first use in this function)
+ 1040 | err = copyfd_io(fd, remotesock, 1, true, &winfo);
+ | ^~~~~
+mptcp_connect.c:1040:59: note: each undeclared identifier is reported only once for each function it appears in
+mptcp_connect.c:1040:23: error: too many arguments to function ‘copyfd_io’; expected 4, have 5
+ 1040 | err = copyfd_io(fd, remotesock, 1, true, &winfo);
+ | ^~~~~~~~~ ~~~~~~
+mptcp_connect.c:845:12: note: declared here
+ 845 | static int copyfd_io(int infd, int peerfd, int outfd, bool close_peerfd)
+ | ^~~~~~~~~
+
+This is caused by commit ff160500c499 ("selftests: mptcp: connect: catch
+IO errors on listen side"), a backport of upstream 14e22b43df25,
+which attempts to use the undeclared variable 'winfo' and passes too many
+arguments to copyfd_io(). Both the winfo variable and the updated
+copyfd_io() function were introduced in upstream
+commit ca7ae8916043 ("selftests: mptcp: mptfo Initiator/Listener"),
+which is not present in v6.1.y.
+
+The goal of the backport is to stop on errors from copyfd_io.
+Therefore, the backport does not depend on the changes in upstream
+commit ca7ae8916043 ("selftests: mptcp: mptfo Initiator/Listener").
+
+This commit simply removes ', &winfo' to fix a build failure.
+
+Fixes: ff160500c499 ("selftests: mptcp: connect: catch IO errors on listen side")
+Signed-off-by: Kenta Akagi <k@mgml.me>
+Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ tools/testing/selftests/net/mptcp/mptcp_connect.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/tools/testing/selftests/net/mptcp/mptcp_connect.c
++++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c
+@@ -1037,7 +1037,7 @@ again:
+
+ SOCK_TEST_TCPULP(remotesock, 0);
+
+- err = copyfd_io(fd, remotesock, 1, true, &winfo);
++ err = copyfd_io(fd, remotesock, 1, true);
+ } else {
+ perror("accept");
+ return 1;