From: "Toke Høiland-Jørgensen" <toke@redhat.com> To: kernel test robot <lkp@intel.com> Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Daniel Borkmann <daniel@iogearbox.net>, "Paul E . McKenney" <paulmck@kernel.org> Subject: Re: kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression Date: Mon, 23 May 2022 12:30:14 +0200 [thread overview] Message-ID: <87y1yspmmh.fsf@toke.dk> (raw) In-Reply-To: <202205222029.xpW3PM1y-lkp@intel.com> kernel test robot <lkp@intel.com> writes: > 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 Hmm, so this is ia64-only? Some kind of macro breakage? Paul, any ideas? -Toke > 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 > > -- > 0-DAY CI Kernel Test Service > https://01.org/lkp
WARNING: multiple messages have this Message-ID (diff)
From: Toke Høiland-Jørgensen <toke@redhat.com> To: kbuild-all@lists.01.org Subject: Re: kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression Date: Mon, 23 May 2022 12:30:14 +0200 [thread overview] Message-ID: <87y1yspmmh.fsf@toke.dk> (raw) In-Reply-To: <202205222029.xpW3PM1y-lkp@intel.com> [-- Attachment #1: Type: text/plain, Size: 7220 bytes --] kernel test robot <lkp@intel.com> writes: > 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(a)intel.com/config) > compiler: ia64-linux-gcc (GCC) 11.3.0 Hmm, so this is ia64-only? Some kind of macro breakage? Paul, any ideas? -Toke > 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 > > -- > 0-DAY CI Kernel Test Service > https://01.org/lkp
next prev parent reply other threads:[~2022-05-23 10:30 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-22 12:30 kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression kernel test robot 2022-05-23 10:30 ` Toke Høiland-Jørgensen [this message] 2022-05-23 10:30 ` Toke Høiland-Jørgensen 2022-05-24 20:51 ` Paul E. McKenney 2022-05-24 20:51 ` Paul E. McKenney 2022-06-01 0:38 ` Luc Van Oostenryck 2022-06-01 0:38 ` Luc Van Oostenryck 2022-06-01 10:26 ` Toke Høiland-Jørgensen 2022-06-01 10:26 ` Toke Høiland-Jørgensen 2022-06-01 11:59 ` Luc Van Oostenryck 2022-06-01 12:00 ` Luc Van Oostenryck 2022-06-01 12:00 ` Luc Van Oostenryck 2022-06-05 16:07 ` [PATCH] ia64: fix sparse warnings with cmpxchg() & xchg() Luc Van Oostenryck 2022-06-05 16:07 ` Luc Van Oostenryck 2022-06-05 19:58 ` Paul E. McKenney 2022-06-05 19:58 ` Paul E. McKenney 2022-06-06 7:53 ` Toke Høiland-Jørgensen 2022-06-06 7:53 ` Toke Høiland-Jørgensen -- strict thread matches above, loose matches on Subject: below -- 2021-11-20 1:45 kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '__rcu' of expression kernel test robot 2021-11-20 1:45 ` kernel test robot
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