linux-kernel - [toke:xdp-queueing-03 3/9] net/bpf/test_run.c:1372:15: warning: cast to pointer from integer of different size

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Message-ID: <202203111957.Pexg2qR6-lkp@intel.com>
Date:   Fri, 11 Mar 2022 19:59:41 +0800
From:   kernel test robot <lkp@...el.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [toke:xdp-queueing-03 3/9] net/bpf/test_run.c:1372:15: warning: cast
 to pointer from integer of different size

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-03
head:   91c92d46077f70b03fd162128dd3373663d529d4
commit: eb1f31b3643b9fb49f4785deab32e3461eca777f [3/9] xdp: add dequeue program type for getting packets from a PIFO
config: xtensa-buildonly-randconfig-r004-20220310 (https://download.01.org/0day-ci/archive/20220311/202203111957.Pexg2qR6-lkp@intel.com/config)
compiler: xtensa-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://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git/commit/?id=eb1f31b3643b9fb49f4785deab32e3461eca777f
        git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git
        git fetch --no-tags toke xdp-queueing-03
        git checkout eb1f31b3643b9fb49f4785deab32e3461eca777f
        # 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=xtensa SHELL=/bin/bash net/bpf/

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/bpf/test_run.c: In function 'bpf_prog_test_run_dequeue':
>> net/bpf/test_run.c:1372:15: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    1372 |         pkt = (void *)retval;
         |               ^


vim +1372 net/bpf/test_run.c

  1347	
  1348	int bpf_prog_test_run_dequeue(struct bpf_prog *prog, const union bpf_attr *kattr,
  1349				      union bpf_attr __user *uattr)
  1350	{
  1351		struct xdp_txq_info txq = { .dev = current->nsproxy->net_ns->loopback_dev };
  1352		u32 repeat = kattr->test.repeat, duration, size;
  1353		struct dequeue_data ctx = { .txq = &txq };
  1354		struct xdp_buff xdp = {};
  1355		struct xdp_frame *pkt;
  1356		int ret = -EINVAL;
  1357		u64 retval;
  1358	
  1359		if (prog->expected_attach_type)
  1360			return -EINVAL;
  1361	
  1362		if (kattr->test.data_in || kattr->test.data_size_in ||
  1363		    kattr->test.ctx_in || kattr->test.ctx_out || repeat > 1)
  1364			return -EINVAL;
  1365	
  1366		ret = bpf_test_run(prog, &ctx, repeat, &retval, &duration, false);
  1367		if (ret)
  1368			return ret;
  1369		if (!retval)
  1370			return bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
  1371	
> 1372		pkt = (void *)retval;
  1373		xdp_convert_frame_to_buff(pkt, &xdp);
  1374		size = xdp.data_end - xdp.data_meta;
  1375		/* We set retval == 1 if pkt != NULL, otherwise 0 */
  1376		ret = bpf_test_finish(kattr, uattr, xdp.data_meta, NULL, size, !!retval, duration);
  1377		xdp_return_frame(pkt);
  1378		return ret;
  1379	}
  1380	

---
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