Messages in this thread | | | Date | Sun, 22 May 2022 20:30:15 +0800 | From | kernel test robot <> | Subject | kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: eaea45fc0e7b6ae439526b4a41d91230c8517336 commit: 782347b6bcad07ddb574422e01e22c92e05928c8 xdp: Add proper __rcu annotations to redirect map entries date: 11 months ago config: ia64-randconfig-s031-20220522 (https://download.01.org/0day-ci/archive/20220522/202205222029.xpW3PM1y-lkp@intel.com/config) compiler: ia64-linux-gcc (GCC) 11.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=782347b6bcad07ddb574422e01e22c92e05928c8 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 782347b6bcad07ddb574422e01e22c92e05928c8 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=ia64 SHELL=/bin/bash kernel/bpf/
If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>) kernel/bpf/devmap.c:561:29: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct bpf_dtab_netdev *dst @@ got struct bpf_dtab_netdev [noderef] __rcu * @@ kernel/bpf/devmap.c:561:29: sparse: expected struct bpf_dtab_netdev *dst kernel/bpf/devmap.c:561:29: sparse: got struct bpf_dtab_netdev [noderef] __rcu * kernel/bpf/devmap.c:657:29: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct bpf_dtab_netdev *dst @@ got struct bpf_dtab_netdev [noderef] __rcu * @@ kernel/bpf/devmap.c:657:29: sparse: expected struct bpf_dtab_netdev *dst kernel/bpf/devmap.c:657:29: sparse: got struct bpf_dtab_netdev [noderef] __rcu * >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression >> kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression
vim +/__rcu +1030 kernel/bpf/devmap.c
990 991 static int dev_map_notification(struct notifier_block *notifier, 992 ulong event, void *ptr) 993 { 994 struct net_device *netdev = netdev_notifier_info_to_dev(ptr); 995 struct bpf_dtab *dtab; 996 int i, cpu; 997 998 switch (event) { 999 case NETDEV_REGISTER: 1000 if (!netdev->netdev_ops->ndo_xdp_xmit || netdev->xdp_bulkq) 1001 break; 1002 1003 /* will be freed in free_netdev() */ 1004 netdev->xdp_bulkq = alloc_percpu(struct xdp_dev_bulk_queue); 1005 if (!netdev->xdp_bulkq) 1006 return NOTIFY_BAD; 1007 1008 for_each_possible_cpu(cpu) 1009 per_cpu_ptr(netdev->xdp_bulkq, cpu)->dev = netdev; 1010 break; 1011 case NETDEV_UNREGISTER: 1012 /* This rcu_read_lock/unlock pair is needed because 1013 * dev_map_list is an RCU list AND to ensure a delete 1014 * operation does not free a netdev_map entry while we 1015 * are comparing it against the netdev being unregistered. 1016 */ 1017 rcu_read_lock(); 1018 list_for_each_entry_rcu(dtab, &dev_map_list, list) { 1019 if (dtab->map.map_type == BPF_MAP_TYPE_DEVMAP_HASH) { 1020 dev_map_hash_remove_netdev(dtab, netdev); 1021 continue; 1022 } 1023 1024 for (i = 0; i < dtab->map.max_entries; i++) { 1025 struct bpf_dtab_netdev *dev, *odev; 1026 1027 dev = rcu_dereference(dtab->netdev_map[i]); 1028 if (!dev || netdev != dev->dev) 1029 continue; > 1030 odev = unrcu_pointer(cmpxchg(&dtab->netdev_map[i], RCU_INITIALIZER(dev), NULL)); 1031 if (dev == odev) 1032 call_rcu(&dev->rcu, 1033 __dev_map_entry_free); 1034 } 1035 } 1036 rcu_read_unlock(); 1037 break; 1038 default: 1039 break; 1040 } 1041 return NOTIFY_OK; 1042 } 1043
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