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/4ee004a30d45cec170d7c5d17... 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(a)intel.com&gt; 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