tree:   https://github.com/zen-kernel/zen-kernel 5.10/master
head:   a2b0fa0a0d28e152d16d20389a8026713ae2b753
commit: 4ee004a30d45cec170d7c5d176068a9a2885d0bb [1131/1926] net-tcp_bbr: v2: BBRv2 ("bbr2") congestion control for Linux TCP
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/zen-kernel/zen-kernel/commit/4ee004a30d45cec170d7c5d176068a9a2885d0bb
        git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen-kernel-zen-kernel 5.10/master
        git checkout 4ee004a30d45cec170d7c5d176068a9a2885d0bb
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> net/ipv4/tcp_bbr2.c:2242:6: warning: no previous prototype for 'bbr2_main' [-Wmissing-prototypes]
    2242 | void bbr2_main(struct sock *sk, const struct rate_sample *rs)
         |      ^~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for SND_ATMEL_SOC_PDC
   Depends on SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && HAS_DMA
   Selected by
   - SND_ATMEL_SOC_SSC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC
   - SND_ATMEL_SOC_SSC_PDC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && ATMEL_SSC


vim +/bbr2_main +2242 net/ipv4/tcp_bbr2.c

  2241 
> 2242  void bbr2_main(struct sock *sk, const struct rate_sample *rs)
  2243  {
  2244          struct tcp_sock *tp = tcp_sk(sk);
  2245          struct bbr *bbr = inet_csk_ca(sk);
  2246          struct bbr_context ctx = { 0 };
  2247          bool update_model = true;
  2248          u32 bw;
  2249 
  2250          bbr->debug.event = '.';  /* init to default NOP (no event yet) */
  2251 
  2252          bbr_update_round_start(sk, rs, &ctx);
  2253          if (bbr->round_start) {
  2254                  bbr->rounds_since_probe =
  2255                          min_t(s32, bbr->rounds_since_probe + 1, 0xFF);
  2256                  bbr2_update_ecn_alpha(sk);
  2257          }
  2258 
  2259          bbr->ecn_in_round  |= rs->is_ece;
  2260          bbr_calculate_bw_sample(sk, rs, &ctx);
  2261 
  2262          if (bbr2_fast_path(sk, &update_model, rs, &ctx))
  2263                  goto out;
  2264 
  2265          if (update_model)
  2266                  bbr2_update_model(sk, rs, &ctx);
  2267 
  2268          bbr_update_gains(sk);
  2269          bw = bbr_bw(sk);
  2270          bbr_set_pacing_rate(sk, bw, bbr->pacing_gain);
  2271          bbr_set_cwnd(sk, rs, rs->acked_sacked, bw, bbr->cwnd_gain,
  2272                       tp->snd_cwnd, &ctx);
  2273          bbr2_bound_cwnd_for_inflight_model(sk);
  2274 
  2275  out:
  2276          bbr->prev_ca_state = inet_csk(sk)->icsk_ca_state;
  2277          bbr->loss_in_cycle |= rs->lost > 0;
  2278          bbr->ecn_in_cycle  |= rs->delivered_ce > 0;
  2279 
  2280          bbr_debug(sk, rs->acked_sacked, rs, &ctx);
  2281  }
  2282 

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org