CC: kbuild-...@lists.01.org CC: linux-ker...@vger.kernel.org TO: Haiyang Zhang <haiya...@microsoft.com> CC: Wei Liu <wei....@kernel.org> CC: Michael Kelley <mikel...@microsoft.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ff1176468d368232b684f75e82563369208bc371 commit: 7c9ff3deeee61b253715dcf968a6307af148c9b2 Drivers: hv: vmbus: Fix duplicate CPU assignments within a device date: 7 days ago :::::: branch date: 16 hours ago :::::: commit date: 7 days ago config: x86_64-randconfig-m001-20210726 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> Reported-by: Dan Carpenter <dan.carpen...@oracle.com> smatch warnings: drivers/hv/channel_mgmt.c:785 init_vp_index() error: uninitialized symbol 'target_cpu'. vim +/target_cpu +785 drivers/hv/channel_mgmt.c a119845f6e98c8 K. Y. Srinivasan 2012-12-01 714 a119845f6e98c8 K. Y. Srinivasan 2012-12-01 715 /* a119845f6e98c8 K. Y. Srinivasan 2012-12-01 716 * Starting with Win8, we can statically distribute the incoming 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 717 * channel interrupt load by binding a channel to VCPU. 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 718 * 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 719 * For pre-win8 hosts or non-performance critical channels we assign the d570aec0f2154e Andrea Parri (Microsoft 2020-04-06 720) * VMBUS_CONNECT_CPU. 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 721) * 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 722) * Starting with win8, performance critical channels will be distributed 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 723) * evenly among all the available NUMA nodes. Once the node is assigned, 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 724) * we will assign the CPU based on a simple round robin scheme. a119845f6e98c8 K. Y. Srinivasan 2012-12-01 725 */ afaa33da08abd1 Andrea Parri (Microsoft 2020-05-22 726) static void init_vp_index(struct vmbus_channel *channel) a119845f6e98c8 K. Y. Srinivasan 2012-12-01 727 { afaa33da08abd1 Andrea Parri (Microsoft 2020-05-22 728) bool perf_chn = hv_is_perf_channel(channel); 7c9ff3deeee61b Haiyang Zhang 2021-07-16 729 u32 i, ncpu = num_online_cpus(); 25355252607ca2 Dexuan Cui 2018-09-23 730 cpumask_var_t available_mask; 9f01ec53458d9e K. Y. Srinivasan 2015-08-05 731 struct cpumask *alloced_mask; 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 732) u32 target_cpu; 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 733) int numa_node; a119845f6e98c8 K. Y. Srinivasan 2012-12-01 734 a119845f6e98c8 K. Y. Srinivasan 2012-12-01 735 if ((vmbus_proto_version == VERSION_WS2008) || 25355252607ca2 Dexuan Cui 2018-09-23 736 (vmbus_proto_version == VERSION_WIN7) || (!perf_chn) || 25355252607ca2 Dexuan Cui 2018-09-23 737 !alloc_cpumask_var(&available_mask, GFP_KERNEL)) { a119845f6e98c8 K. Y. Srinivasan 2012-12-01 738 /* a119845f6e98c8 K. Y. Srinivasan 2012-12-01 739 * Prior to win8, all channel interrupts are d570aec0f2154e Andrea Parri (Microsoft 2020-04-06 740) * delivered on VMBUS_CONNECT_CPU. a119845f6e98c8 K. Y. Srinivasan 2012-12-01 741 * Also if the channel is not a performance critical d570aec0f2154e Andrea Parri (Microsoft 2020-04-06 742) * channel, bind it to VMBUS_CONNECT_CPU. d570aec0f2154e Andrea Parri (Microsoft 2020-04-06 743) * In case alloc_cpumask_var() fails, bind it to d570aec0f2154e Andrea Parri (Microsoft 2020-04-06 744) * VMBUS_CONNECT_CPU. a119845f6e98c8 K. Y. Srinivasan 2012-12-01 745 */ d570aec0f2154e Andrea Parri (Microsoft 2020-04-06 746) channel->target_cpu = VMBUS_CONNECT_CPU; afaa33da08abd1 Andrea Parri (Microsoft 2020-05-22 747) if (perf_chn) afaa33da08abd1 Andrea Parri (Microsoft 2020-05-22 748) hv_set_alloced_cpu(VMBUS_CONNECT_CPU); d3ba720dd58cdf K. Y. Srinivasan 2014-04-08 749 return; a119845f6e98c8 K. Y. Srinivasan 2012-12-01 750 } ce59fec836a9b4 Vitaly Kuznetsov 2015-05-06 751 7c9ff3deeee61b Haiyang Zhang 2021-07-16 752 for (i = 1; i <= ncpu + 1; i++) { 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 753 while (true) { 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 754) numa_node = next_numa_node_id++; 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 755) if (numa_node == nr_node_ids) { 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 756) next_numa_node_id = 0; 509879bdb30b8e K. Y. Srinivasan 2016-09-02 757 continue; 509879bdb30b8e K. Y. Srinivasan 2016-09-02 758 } 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 759) if (cpumask_empty(cpumask_of_node(numa_node))) 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 760 continue; 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 761 break; 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 762 } 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 763) alloced_mask = &hv_context.hv_numa_map[numa_node]; 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 764 9f01ec53458d9e K. Y. Srinivasan 2015-08-05 765 if (cpumask_weight(alloced_mask) == 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 766) cpumask_weight(cpumask_of_node(numa_node))) { ce59fec836a9b4 Vitaly Kuznetsov 2015-05-06 767 /* 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 768 * We have cycled through all the CPUs in the node; 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 769 * reset the alloced map. ce59fec836a9b4 Vitaly Kuznetsov 2015-05-06 770 */ 9f01ec53458d9e K. Y. Srinivasan 2015-08-05 771 cpumask_clear(alloced_mask); ce59fec836a9b4 Vitaly Kuznetsov 2015-05-06 772 } ce59fec836a9b4 Vitaly Kuznetsov 2015-05-06 773 7c9ff3deeee61b Haiyang Zhang 2021-07-16 774 cpumask_xor(available_mask, alloced_mask, 7c9ff3deeee61b Haiyang Zhang 2021-07-16 775 cpumask_of_node(numa_node)); 79fd8e706637a5 Vitaly Kuznetsov 2016-01-27 776 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 777) target_cpu = cpumask_first(available_mask); 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 778) cpumask_set_cpu(target_cpu, alloced_mask); 1f656ff3fdddc2 K. Y. Srinivasan 2015-05-30 779 7c9ff3deeee61b Haiyang Zhang 2021-07-16 780 if (channel->offermsg.offer.sub_channel_index >= ncpu || 7c9ff3deeee61b Haiyang Zhang 2021-07-16 781 i > ncpu || !hv_cpuself_used(target_cpu, channel)) 7c9ff3deeee61b Haiyang Zhang 2021-07-16 782 break; 7c9ff3deeee61b Haiyang Zhang 2021-07-16 783 } 7c9ff3deeee61b Haiyang Zhang 2021-07-16 784 8ef4c4abbbcdcd Andrea Parri (Microsoft 2020-04-06 @785) channel->target_cpu = target_cpu; 25355252607ca2 Dexuan Cui 2018-09-23 786 25355252607ca2 Dexuan Cui 2018-09-23 787 free_cpumask_var(available_mask); a119845f6e98c8 K. Y. Srinivasan 2012-12-01 788 } a119845f6e98c8 K. Y. Srinivasan 2012-12-01 789 :::::: The code at line 785 was first introduced by commit :::::: 8ef4c4abbbcdcd9d4bc0fd9454df03e6dac24b73 Drivers: hv: vmbus: Remove the unused HV_LOCALIZED channel affinity logic :::::: TO: Andrea Parri (Microsoft) <parri.and...@gmail.com> :::::: CC: Wei Liu <wei....@kernel.org> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
.config.gz
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