From: Nick Desaulniers <ndesaulniers@google.com>
To: Jakub Sitnicki <jakub@cloudflare.com>
Cc: bpf <bpf@vger.kernel.org>,
kbuild-all@lists.01.org,
clang-built-linux <clang-built-linux@googlegroups.com>,
Network Development <netdev@vger.kernel.org>,
kernel-team@cloudflare.com, kbuild test robot <lkp@intel.com>
Subject: Re: [PATCH bpf-next 5/8] bpf: Add link-based BPF program attachment to network namespace
Date: Thu, 4 Jun 2020 16:38:44 -0700 [thread overview]
Message-ID: <CAKwvOdmof_tGVAN+gkq8R3Hq_sRDHXE_cB+37Sd7gKvgzVzVHw@mail.gmail.com> (raw)
In-Reply-To: <202005281031.S7IMfvFG%lkp@intel.com>
On Wed, May 27, 2020 at 8:19 PM kbuild test robot <lkp@intel.com> wrote:
>
> Hi Jakub,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on bpf-next/master]
> [also build test WARNING on net-next/master next-20200526]
> [cannot apply to bpf/master net/master linus/master v5.7-rc7]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url: https://github.com/0day-ci/linux/commits/Jakub-Sitnicki/Link-based-program-attachment-to-network-namespaces/20200528-011159
> base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> config: arm-randconfig-r035-20200527 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b)
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install arm cross compiling tool for clang build
> # apt-get install binutils-arm-linux-gnueabi
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
> >> kernel/bpf/net_namespace.c:130:6: warning: variable 'inum' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
This looks legit to me. Please fix.
> if (net)
> ^~~
> kernel/bpf/net_namespace.c:134:26: note: uninitialized use occurs here
> info->netns.netns_ino = inum;
> ^~~~
> kernel/bpf/net_namespace.c:130:2: note: remove the 'if' if its condition is always true
> if (net)
> ^~~~~~~~
> kernel/bpf/net_namespace.c:123:19: note: initialize the variable 'inum' to silence this warning
> unsigned int inum;
> ^
> = 0
> 1 warning generated.
>
> vim +130 kernel/bpf/net_namespace.c
>
> 118
> 119 static int bpf_netns_link_fill_info(const struct bpf_link *link,
> 120 struct bpf_link_info *info)
> 121 {
> 122 const struct bpf_netns_link *net_link;
> 123 unsigned int inum;
> 124 struct net *net;
> 125
> 126 net_link = container_of(link, struct bpf_netns_link, link);
> 127
> 128 rcu_read_lock();
> 129 net = rcu_dereference(net_link->net);
> > 130 if (net)
> 131 inum = net->ns.inum;
> 132 rcu_read_unlock();
> 133
> 134 info->netns.netns_ino = inum;
> 135 info->netns.attach_type = net_link->type;
> 136 return 0;
> 137 }
> 138
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>
> --
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--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2020-06-04 23:38 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 17:08 [PATCH bpf-next 0/8] Link-based program attachment to network namespaces Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 1/8] flow_dissector: Don't grab update-side lock on prog detach from pre_exit Jakub Sitnicki
2020-05-27 17:35 ` sdf
2020-05-27 17:08 ` [PATCH bpf-next 2/8] flow_dissector: Pull locking up from prog attach callback Jakub Sitnicki
2020-05-27 17:35 ` sdf
2020-05-27 17:08 ` [PATCH bpf-next 3/8] net: Introduce netns_bpf for BPF programs attached to netns Jakub Sitnicki
2020-05-27 17:40 ` sdf
2020-05-27 19:31 ` Jakub Sitnicki
2020-05-27 20:36 ` sdf
2020-05-27 17:08 ` [PATCH bpf-next 4/8] flow_dissector: Move out netns_bpf prog callbacks Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 5/8] bpf: Add link-based BPF program attachment to network namespace Jakub Sitnicki
2020-05-27 17:48 ` sdf
2020-05-27 19:54 ` Jakub Sitnicki
2020-05-27 20:38 ` sdf
2020-05-28 10:34 ` Jakub Sitnicki
2020-05-27 20:53 ` sdf
2020-05-28 11:03 ` Jakub Sitnicki
2020-05-28 16:09 ` sdf
2020-05-28 2:54 ` kbuild test robot
2020-06-04 23:38 ` Nick Desaulniers [this message]
2020-06-05 14:41 ` Jakub Sitnicki
2020-05-28 5:56 ` Andrii Nakryiko
2020-05-28 12:26 ` Jakub Sitnicki
2020-05-28 18:09 ` Andrii Nakryiko
2020-05-28 18:48 ` Alexei Starovoitov
2020-05-28 13:30 ` Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 6/8] libbpf: Add support for bpf_link-based netns attachment Jakub Sitnicki
2020-05-28 5:59 ` Andrii Nakryiko
2020-05-28 13:05 ` Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 7/8] bpftool: Support link show for netns-attached links Jakub Sitnicki
2020-05-28 6:02 ` Andrii Nakryiko
2020-05-28 13:10 ` Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 8/8] selftests/bpf: Add tests for attaching bpf_link to netns Jakub Sitnicki
2020-05-28 6:08 ` Andrii Nakryiko
2020-05-28 13:29 ` Jakub Sitnicki
2020-05-28 18:31 ` Andrii Nakryiko
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