Hi, [auto build test WARNING on net-next/master] [also build test WARNING on v4.7-rc7 next-20160711] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/sunil-kovvuri-gmail-com/net-thunderx-Add-support-for-81xx-and-83xx/20160711-181138 config: x86_64-randconfig-i0-201628 (attached as .config) compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): drivers/net/ethernet/cavium/thunder/nic_main.c: In function 'nic_enable_msix': >> drivers/net/ethernet/cavium/thunder/nic_main.c:944:30: warning: iteration 10 >> invokes undefined behavior [-Waggressive-loop-optimizations] nic->msix_entries[i].entry = i; ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ drivers/net/ethernet/cavium/thunder/nic_main.c:943:2: note: within this loop for (i = 0; i < nic->num_vec; i++) ^~~ vim +944 drivers/net/ethernet/cavium/thunder/nic_main.c 4863dea3 Sunil Goutham 2015-05-26 928 vf + (mbx * vf_per_mbx_reg)); 92dc8769 Sunil Goutham 2015-08-30 929 4863dea3 Sunil Goutham 2015-05-26 930 nic_handle_mbx_intr(nic, vf + (mbx * vf_per_mbx_reg)); 4863dea3 Sunil Goutham 2015-05-26 931 nic_clear_mbx_intr(nic, vf, mbx); 4863dea3 Sunil Goutham 2015-05-26 932 } 4863dea3 Sunil Goutham 2015-05-26 933 } 4863dea3 Sunil Goutham 2015-05-26 934 return IRQ_HANDLED; 4863dea3 Sunil Goutham 2015-05-26 935 } 4863dea3 Sunil Goutham 2015-05-26 936 4863dea3 Sunil Goutham 2015-05-26 937 static int nic_enable_msix(struct nicpf *nic) 4863dea3 Sunil Goutham 2015-05-26 938 { 4863dea3 Sunil Goutham 2015-05-26 939 int i, ret; 4863dea3 Sunil Goutham 2015-05-26 940 45ff737f Sunil Goutham 2016-07-11 941 nic->num_vec = pci_msix_vec_count(nic->pdev); 4863dea3 Sunil Goutham 2015-05-26 942 4863dea3 Sunil Goutham 2015-05-26 943 for (i = 0; i < nic->num_vec; i++) 4863dea3 Sunil Goutham 2015-05-26 @944 nic->msix_entries[i].entry = i; 4863dea3 Sunil Goutham 2015-05-26 945 4863dea3 Sunil Goutham 2015-05-26 946 ret = pci_enable_msix(nic->pdev, nic->msix_entries, nic->num_vec); 4863dea3 Sunil Goutham 2015-05-26 947 if (ret) { 4863dea3 Sunil Goutham 2015-05-26 948 dev_err(&nic->pdev->dev, 45ff737f Sunil Goutham 2016-07-11 949 "Request for #%d msix vectors failed, returned %d\n", 45ff737f Sunil Goutham 2016-07-11 950 nic->num_vec, ret); 4863dea3 Sunil Goutham 2015-05-26 951 return ret; 4863dea3 Sunil Goutham 2015-05-26 952 } :::::: The code at line 944 was first introduced by commit :::::: 4863dea3fab01734768c9f7fc2c1590a8f1f6266 net: Adding support for Cavium ThunderX network controller :::::: TO: Sunil Goutham <[email protected]> :::::: CC: David S. Miller <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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