[zen:6.5/bbr3 1/1] net/ipv4/tcp_bbr.c:500: undefined reference to `__udivdi3'

[zen:6.5/bbr3 1/1] net/ipv4/tcp_bbr.c:500: undefined reference to `__udivdi3'

[kernel test robot]

tree:   https://github.com/zen-kernel/zen-kernel 6.5/bbr3
head:   bcb27e4adacda606c76349bfba3305db6ea83887
commit: bcb27e4adacda606c76349bfba3305db6ea83887 [1/1] bbr3-6.5: initial import
config: i386-randconfig-011-20230829 (https://download.01.org/0day-ci/archive/20230829/202308291728.mXShicTc-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230829/202308291728.mXShicTc-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/202308291728.mXShicTc-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: net/ipv4/tcp_bbr.o: in function `bbr_tso_segs_generic':
>> net/ipv4/tcp_bbr.c:500: undefined reference to `__udivdi3'


vim +500 net/ipv4/tcp_bbr.c

   474	
   475	/* Return the number of segments BBR would like in a TSO/GSO skb, given a
   476	 * particular max gso size as a constraint. TODO: make this simpler and more
   477	 * consistent by switching bbr to just call tcp_tso_autosize().
   478	 */
   479	static u32 bbr_tso_segs_generic(struct sock *sk, unsigned int mss_now,
   480					u32 gso_max_size)
   481	{
   482		struct bbr *bbr = inet_csk_ca(sk);
   483		u32 segs, r;
   484		u64 bytes;
   485	
   486		/* Budget a TSO/GSO burst size allowance based on bw (pacing_rate). */
   487		bytes = sk->sk_pacing_rate >> sk->sk_pacing_shift;
   488	
   489		/* Budget a TSO/GSO burst size allowance based on min_rtt. For every
   490		 * K = 2^tso_rtt_shift microseconds of min_rtt, halve the burst.
   491		 * The min_rtt-based burst allowance is: 64 KBytes / 2^(min_rtt/K)
   492		 */
   493		if (bbr_param(sk, tso_rtt_shift)) {
   494			r = bbr->min_rtt_us >> bbr_param(sk, tso_rtt_shift);
   495			if (r < BITS_PER_TYPE(u32))   /* prevent undefined behavior */
   496				bytes += GSO_LEGACY_MAX_SIZE >> r;
   497		}
   498	
   499		bytes = min_t(u32, bytes, gso_max_size - 1 - MAX_TCP_HEADER);
 > 500		segs = max_t(u32, bytes / mss_now,
   501			     sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs);
   502		return segs;
   503	}
   504	

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https://github.com/intel/lkp-tests/wiki