Hi Salil, [auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Salil-Mehta/net-hns-Fix-to-conditionally-convey-RX-checksum-flag-to-stack/20161206-022948 config: i386-allmodconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/net/ethernet/hisilicon/hns/hns_enet.c: In function 'hns_nic_rx_poll_one': >> drivers/net/ethernet/hisilicon/hns/hns_enet.c:606:5: warning: 'l3id' may be >> used uninitialized in this function [-Wmaybe-uninitialized] if ((l3id != HNS_RX_FLAG_L3ID_IPV4) && (l3id != HNS_RX_FLAG_L3ID_IPV6)) ^ drivers/net/ethernet/hisilicon/hns/hns_enet.c:573:6: note: 'l3id' was declared here u32 l3id; ^~~~ >> drivers/net/ethernet/hisilicon/hns/hns_enet.c:618:37: warning: 'l4id' may be >> used uninitialized in this function [-Wmaybe-uninitialized] if ((l4id != HNS_RX_FLAG_L4ID_TCP) && ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~ (l4id != HNS_RX_FLAG_L4ID_UDP) && ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/hisilicon/hns/hns_enet.c:574:6: note: 'l4id' was declared here u32 l4id; ^~~~ vim +/l3id +606 drivers/net/ethernet/hisilicon/hns/hns_enet.c 600 * checksum or any other L3/L4 error, we will not (cannot) convey 601 * checksum status for such cases to upper stack and will not maintain 602 * the RX L3/L4 checksum counters as well. 603 */ 604 605 /* check L3 protocol for which checksum is supported */ > 606 if ((l3id != HNS_RX_FLAG_L3ID_IPV4) && (l3id != > HNS_RX_FLAG_L3ID_IPV6)) 607 return; 608 609 /* check for any(not just checksum)flagged L3 protocol errors */ 610 if (unlikely(hnae_get_bit(flag, HNS_RXD_L3E_B))) 611 return; 612 613 /* we do not support checksum of fragmented packets */ 614 if (unlikely(hnae_get_bit(flag, HNS_RXD_FRAG_B))) 615 return; 616 617 /* check L4 protocol for which checksum is supported */ > 618 if ((l4id != HNS_RX_FLAG_L4ID_TCP) && 619 (l4id != HNS_RX_FLAG_L4ID_UDP) && 620 (l4id != HNS_RX_FLAG_L4ID_SCTP)) 621 return; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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