netdev - Re: [PATCH net-next 08/19] drop_monitor: add net device refcount tracker

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Message-ID: <CANn89i+n4RAywMtDVy8ffwt0uk3PHnwWVVprsqQiA-cPDzYdxA@mail.gmail.com>
Date:   Wed, 1 Dec 2021 21:57:19 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kbuild-all@...ts.01.org,
        netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH net-next 08/19] drop_monitor: add net device refcount tracker

On Wed, Dec 1, 2021 at 9:41 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Eric,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on net-next/master]
>
> url:    https://github.com/0day-ci/linux/commits/Eric-Dumazet/net-add-preliminary-netdev-refcount-tracking/20211202-112353
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 8057cbb8335cf6d419866737504473833e1d128a
> config: nds32-allyesconfig (https://download.01.org/0day-ci/archive/20211202/202112021345.IlporM5t-lkp@intel.com/config)
> compiler: nds32le-linux-gcc (GCC) 11.2.0
> 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
>         # https://github.com/0day-ci/linux/commit/6b336d0b301ebb1097132101a9e3bd01f71c40d4
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Eric-Dumazet/net-add-preliminary-netdev-refcount-tracking/20211202-112353
>         git checkout 6b336d0b301ebb1097132101a9e3bd01f71c40d4
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nds32 SHELL=/bin/bash net/core/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
>    net/core/drop_monitor.c: In function 'net_dm_hw_metadata_free':
> >> net/core/drop_monitor.c:869:47: warning: passing argument 2 of 'dev_put_track' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>      869 |         dev_put_track(hw_metadata->input_dev, &hw_metadata->dev_tracker);
>          |                                               ^~~~~~~~~~~~~~~~~~~~~~~~~
>    In file included from net/core/drop_monitor.c:10:
>    include/linux/netdevice.h:3863:53: note: expected 'struct ref_tracker **' but argument is of type 'struct ref_tracker * const*'
>     3863 |                                  netdevice_tracker *tracker)
>          |                                  ~~~~~~~~~~~~~~~~~~~^~~~~~~
>
>
> vim +869 net/core/drop_monitor.c
>
>    865
>    866  static void
>    867  net_dm_hw_metadata_free(const struct devlink_trap_metadata *hw_metadata)

Yep, I have removed this not really useful  const qualifier

net_dm_hw_metadata_free(struct devlink_trap_metadata *hw_metadata)
...


>    868  {
>  > 869          dev_put_track(hw_metadata->input_dev, &hw_metadata->dev_tracker);
>    870          kfree(hw_metadata->fa_cookie);
>    871          kfree(hw_metadata->trap_name);
>    872          kfree(hw_metadata->trap_group_name);
>    873          kfree(hw_metadata);
>    874  }
>    875
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org