[kkdwivedi:bpf-napi 37/46] net/ipv4/tcp_output.c:3307: undefined reference to `__tcp_bpf_tx_defer'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/kkdwivedi/linux bpf-napi
head:   447e73927e821b61da411e58b9444d831373f359
commit: 7a9d3d30a1aaf04d812c1ccb01d50db1cb62083b [37/46] tcp: Let a BPF kthread do the xmit work of sockets assigned to it
config: xtensa-randconfig-2000-20261110 (https://download.01.org/0day-ci/archive/20261110/202611102113.Mdm4eGif-lkp@intel.com/config)
compiler: xtensa-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261110/202611102113.Mdm4eGif-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202611102113.Mdm4eGif-lkp@intel.com/

All errors (new ones prefixed by >>):

   `.exit.text' referenced in section `__jump_table' of fs/fuse/inode.o: defined in discarded section `.exit.text' of fs/fuse/inode.o
   `.exit.text' referenced in section `__jump_table' of fs/fuse/inode.o: defined in discarded section `.exit.text' of fs/fuse/inode.o
   `.exit.text' referenced in section `__jump_table' of drivers/target/target_core_configfs.o: defined in discarded section `.exit.text' of drivers/target/target_core_configfs.o
   `.exit.text' referenced in section `__jump_table' of drivers/target/target_core_configfs.o: defined in discarded section `.exit.text' of drivers/target/target_core_configfs.o
   `.exit.text' referenced in section `__jump_table' of net/bluetooth/6lowpan.o: defined in discarded section `.exit.text' of net/bluetooth/6lowpan.o
   `.exit.text' referenced in section `__jump_table' of net/bluetooth/6lowpan.o: defined in discarded section `.exit.text' of net/bluetooth/6lowpan.o
   `.exit.text' referenced in section `__jump_table' of net/bluetooth/6lowpan.o: defined in discarded section `.exit.text' of net/bluetooth/6lowpan.o
   `.exit.text' referenced in section `__jump_table' of net/bluetooth/6lowpan.o: defined in discarded section `.exit.text' of net/bluetooth/6lowpan.o
   `.exit.text' referenced in section `__jump_table' of net/bluetooth/6lowpan.o: defined in discarded section `.exit.text' of net/bluetooth/6lowpan.o
   `.exit.text' referenced in section `__jump_table' of net/bluetooth/6lowpan.o: defined in discarded section `.exit.text' of net/bluetooth/6lowpan.o
   drivers/clocksource/timer-mediatek.o: in function `mtk_timer_probe':
   drivers/clocksource/timer-mediatek.c:356:(.text+0x50a): dangerous relocation: windowed longcall crosses 1GB boundary; return may fail: *UND*
   `.exit.text' referenced in section `__jump_table' of net/netfilter/ipset/ip_set_core.o: defined in discarded section `.exit.text' of net/netfilter/ipset/ip_set_core.o
   `.exit.text' referenced in section `__jump_table' of net/netfilter/ipset/ip_set_core.o: defined in discarded section `.exit.text' of net/netfilter/ipset/ip_set_core.o
   xtensa-linux-ld: net/ipv4/tcp_output.o: in function `tcp_write_xmit':
>> net/ipv4/tcp_output.c:3307: undefined reference to `__tcp_bpf_tx_defer'
   xtensa-linux-ld: net/ipv4/tcp_output.o: in function `__tcp_push_pending_frames':
>> include/net/tcp.h:764: undefined reference to `__tcp_bpf_tx_defer'
   xtensa-linux-ld: net/ipv4/tcp_output.o: in function `__tcp_push_pending_frames':
   net/ipv4/tcp_output.c:3327: undefined reference to `__tcp_bpf_tx_defer'
   xtensa-linux-ld: net/ipv4/tcp_output.o: in function `tcp_push_one':
>> include/net/tcp.h:764: undefined reference to `__tcp_bpf_tx_defer'
   xtensa-linux-ld: net/ipv4/tcp_output.o: in function `tcp_xmit_retransmit_queue.part.91':
   net/ipv4/tcp_output.c:1328: undefined reference to `__tcp_bpf_tx_defer'
   xtensa-linux-ld: net/ipv4/tcp_output.o:include/net/tcp.h:764: more undefined references to `__tcp_bpf_tx_defer' follow
   `.exit.text' referenced in section `__jump_table' of net/ceph/ceph_common.o: defined in discarded section `.exit.text' of net/ceph/ceph_common.o
   `.exit.text' referenced in section `__jump_table' of net/ceph/ceph_common.o: defined in discarded section `.exit.text' of net/ceph/ceph_common.o


vim +3307 net/ipv4/tcp_output.c

^1da177e4c3f41 Linus Torvalds          2005-04-16  3300  
a762a9800752f0 David S. Miller         2005-07-05  3301  /* Push out any pending frames which were held back due to
a762a9800752f0 David S. Miller         2005-07-05  3302   * TCP_CORK or attempt at coalescing tiny packets.
a762a9800752f0 David S. Miller         2005-07-05  3303   * The socket must be locked by the caller.
a762a9800752f0 David S. Miller         2005-07-05  3304   */
9e412ba7632f71 Ilpo Järvinen           2007-04-20  3305  void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
9e412ba7632f71 Ilpo Järvinen           2007-04-20  3306  			       int nonagle)
a762a9800752f0 David S. Miller         2005-07-05 @3307  {
726e07a8a38168 Ilpo Järvinen           2008-12-05  3308  	/* If we are closed, the bytes will have to remain here.
726e07a8a38168 Ilpo Järvinen           2008-12-05  3309  	 * In time closedown will finish, we empty the write queue and
726e07a8a38168 Ilpo Järvinen           2008-12-05  3310  	 * all will be happy.
726e07a8a38168 Ilpo Järvinen           2008-12-05  3311  	 */
726e07a8a38168 Ilpo Järvinen           2008-12-05  3312  	if (unlikely(sk->sk_state == TCP_CLOSE))
726e07a8a38168 Ilpo Järvinen           2008-12-05  3313  		return;
726e07a8a38168 Ilpo Järvinen           2008-12-05  3314  
7a9d3d30a1aaf0 Kumar Kartikeya Dwivedi 2026-11-10  3315  	if (tcp_bpf_tx_defer(sk, nonagle))
7a9d3d30a1aaf0 Kumar Kartikeya Dwivedi 2026-11-10  3316  		return;
7a9d3d30a1aaf0 Kumar Kartikeya Dwivedi 2026-11-10  3317  
99a1dec70d5acb Mel Gorman              2012-07-31  3318  	if (tcp_write_xmit(sk, cur_mss, nonagle, 0,
7450aaf61f0ae2 Eric Dumazet            2015-11-30  3319  			   sk_gfp_mask(sk, GFP_ATOMIC)))
9e412ba7632f71 Ilpo Järvinen           2007-04-20  3320  		tcp_check_probe_timer(sk);
a762a9800752f0 David S. Miller         2005-07-05  3321  }
a762a9800752f0 David S. Miller         2005-07-05  3322  

:::::: The code at line 3307 was first introduced by commit
:::::: a762a9800752f05fa8768bb0ac35d0e7f1bcfe7f [TCP]: Kill extra cwnd validate in __tcp_push_pending_frames().

:::::: TO: David S. Miller <davem@davemloft.net>
:::::: CC: David S. Miller <davem@davemloft.net>

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