tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-linux-5.4.y head: f85baf8e2e6374594eb76d4c14ada9d62a2fa98b commit: f85baf8e2e6374594eb76d4c14ada9d62a2fa98b [1/1] Merge tag 'v5.4.69' of http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into ti-linux-5.4.y config: alpha-randconfig-r026-20201013 (attached as .config) compiler: alpha-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 git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-linux-5.4.y git checkout f85baf8e2e6374594eb76d4c14ada9d62a2fa98b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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/hsr/hsr_forward.c: In function 'prp_fill_rct': 244 | skb_put_padto(skb, VLAN_ETH_ZLEN); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/hsr/hsr_forward.c:246:3: warning: ignoring return value of 'skb_put_padto', declared with attribute warn_unused_result [-Wunused-result] 246 | skb_put_padto(skb, ETH_ZLEN); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/hsr/hsr_forward.c: In function 'hsr_fill_tag': net/hsr/hsr_forward.c:279:2: warning: ignoring return value of 'skb_put_padto', declared with attribute warn_unused_result [-Wunused-result] 279 | skb_put_padto(skb, ETH_ZLEN + HSR_HLEN); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/skb_put_padto +244 net/hsr/hsr_forward.c cec32b3c1209701 Murali Karicheri 2020-06-02 232 cec32b3c1209701 Murali Karicheri 2020-06-02 233 /* Tailroom for PRP rct should have been created before calling this */ cec32b3c1209701 Murali Karicheri 2020-06-02 234 static void prp_fill_rct(struct sk_buff *skb, struct hsr_frame_info *frame, cec32b3c1209701 Murali Karicheri 2020-06-02 235 struct hsr_port *port) cec32b3c1209701 Murali Karicheri 2020-06-02 236 { cec32b3c1209701 Murali Karicheri 2020-06-02 237 struct prp_rct *trailer; cec32b3c1209701 Murali Karicheri 2020-06-02 238 int lsdu_size; cec32b3c1209701 Murali Karicheri 2020-06-02 239 cec32b3c1209701 Murali Karicheri 2020-06-02 240 if (!skb) cec32b3c1209701 Murali Karicheri 2020-06-02 241 return; cec32b3c1209701 Murali Karicheri 2020-06-02 242 cec32b3c1209701 Murali Karicheri 2020-06-02 243 if (frame->is_vlan) cec32b3c1209701 Murali Karicheri 2020-06-02 @244 skb_put_padto(skb, VLAN_ETH_ZLEN); cec32b3c1209701 Murali Karicheri 2020-06-02 245 else cec32b3c1209701 Murali Karicheri 2020-06-02 246 skb_put_padto(skb, ETH_ZLEN); cec32b3c1209701 Murali Karicheri 2020-06-02 247 cec32b3c1209701 Murali Karicheri 2020-06-02 248 trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN); cec32b3c1209701 Murali Karicheri 2020-06-02 249 lsdu_size = skb->len - 14; cec32b3c1209701 Murali Karicheri 2020-06-02 250 if (frame->is_vlan) cec32b3c1209701 Murali Karicheri 2020-06-02 251 lsdu_size -= 4; cec32b3c1209701 Murali Karicheri 2020-06-02 252 prp_set_lan_id(trailer, port); cec32b3c1209701 Murali Karicheri 2020-06-02 253 set_prp_LSDU_size(trailer, lsdu_size); cec32b3c1209701 Murali Karicheri 2020-06-02 254 trailer->sequence_nr = htons(frame->sequence_nr); cec32b3c1209701 Murali Karicheri 2020-06-02 255 trailer->PRP_suffix = htons(ETH_P_PRP); cec32b3c1209701 Murali Karicheri 2020-06-02 256 } cec32b3c1209701 Murali Karicheri 2020-06-02 257 :::::: The code at line 244 was first introduced by commit :::::: cec32b3c120970149886c47f9e5b7e09c73ba020 net: prp: add packet handling support :::::: TO: Murali Karicheri <m-karicheri2(a)ti.com&gt; :::::: CC: Murali Karicheri <m-karicheri2(a)ti.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org