This is a "set but not used" warning, I can fix it after. Thanks. On Sun, Jun 20, 2021 at 11:50 PM kernel test robot <lkp(a)intel.com&gt; wrote: > > Hi Xin, > > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on net-next/master] > > url: https://github.com/0day-ci/linux/commits/Xin-Long/sctp-implement-RFC8899-... > base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git adc2e56ebe6377f5c032d96aee0feac30a640453 > config: i386-randconfig-r023-20210620 (attached as .config) > compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 > reproduce (this is a W=1 build): > # https://github.com/0day-ci/linux/commit/fcac1d6488c8bc7cb69af9e8051686a67... > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Xin-Long/sctp-implement-RFC8899-Packetization-Layer-Path-MTU-Discovery-for-SCTP-transport/20210621-094007 > git checkout fcac1d6488c8bc7cb69af9e8051686a674d94fc3 > # save the attached .config to linux build tree > make W=1 ARCH=i386 > > 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/sctp/output.c:215:16: warning: no previous prototype for 'sctp_packet_bundle_pad' [-Wmissing-prototypes] > 215 | enum sctp_xmit sctp_packet_bundle_pad(struct sctp_packet *pkt, struct sctp_chunk *chunk) > | ^~~~~~~~~~~~~~~~~~~~~~ > net/sctp/output.c: In function 'sctp_packet_bundle_pad': > >> net/sctp/output.c:219:20: warning: variable 'sp' set but not used [-Wunused-but-set-variable] > 219 | struct sctp_sock *sp; > | ^~ > > > vim +/sctp_packet_bundle_pad +215 net/sctp/output.c > > 213 > 214 /* Try to bundle a pad chunk into a packet with a heartbeat chunk for PLPMTUTD probe */ > > 215 enum sctp_xmit sctp_packet_bundle_pad(struct sctp_packet *pkt, struct sctp_chunk *chunk) > 216 { > 217 struct sctp_transport *t = pkt->transport; > 218 struct sctp_chunk *pad; > > 219 struct sctp_sock *sp; > 220 int overhead = 0; > 221 > 222 if (!chunk->pmtu_probe) > 223 return SCTP_XMIT_OK; > 224 > 225 sp = sctp_sk(t->asoc->base.sk); > 226 > 227 /* calculate the Padding Data size for the pad chunk */ > 228 overhead += sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); > 229 overhead += sizeof(struct sctp_sender_hb_info) + sizeof(struct sctp_pad_chunk); > 230 pad = sctp_make_pad(t->asoc, t->pl.probe_size - overhead); > 231 if (!pad) > 232 return SCTP_XMIT_DELAY; > 233 > 234 list_add_tail(&pad->list, &pkt->chunk_list); > 235 pkt->size += SCTP_PAD4(ntohs(pad->chunk_hdr->length)); > 236 chunk->transport = t; > 237 > 238 return SCTP_XMIT_OK; > 239 } > 240 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org