Re: [PATCH bpf-next 4/4] bpf: try to use existing cgroup storage in bpf_prog_test_run_skb

[kernel test robot <lkp@xxxxxxxxx>]

Hi Dmitry,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Dmitry-Yakunin/bpf-cgroup-skb-improvements-for-bpf_prog_test_run/20200714-022728
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: m68k-sun3_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

   net/bpf/test_run.c: In function 'bpf_prog_find_active_storage':
>> net/bpf/test_run.c:47:9: error: implicit declaration of function 'task_dfl_cgroup' [-Werror=implicit-function-declaration]
      47 |  cgrp = task_dfl_cgroup(current);
         |         ^~~~~~~~~~~~~~~
>> net/bpf/test_run.c:47:7: warning: assignment to 'struct cgroup *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      47 |  cgrp = task_dfl_cgroup(current);
         |       ^
>> net/bpf/test_run.c:50:13: error: dereferencing pointer to incomplete type 'struct cgroup'
      50 |         cgrp->bpf.effective[BPF_CGROUP_INET_INGRESS]);
         |             ^~
   net/bpf/test_run.c: In function 'bpf_test_run':
   net/bpf/test_run.c:67:8: error: implicit declaration of function 'bpf_cgroup_storages_alloc'; did you mean 'bpf_cgroup_storage_alloc'? [-Werror=implicit-function-declaration]
      67 |  ret = bpf_cgroup_storages_alloc(dummy_storage, prog);
         |        ^~~~~~~~~~~~~~~~~~~~~~~~~
         |        bpf_cgroup_storage_alloc
   net/bpf/test_run.c:115:2: error: implicit declaration of function 'bpf_cgroup_storages_free'; did you mean 'bpf_cgroup_storage_free'? [-Werror=implicit-function-declaration]
     115 |  bpf_cgroup_storages_free(dummy_storage);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~
         |  bpf_cgroup_storage_free
   cc1: some warnings being treated as errors

vim +/task_dfl_cgroup +47 net/bpf/test_run.c

    38	
    39	static struct bpf_cgroup_storage **bpf_prog_find_active_storage(struct bpf_prog *prog)
    40	{
    41		struct bpf_prog_array_item *item;
    42		struct cgroup *cgrp;
    43	
    44		if (prog->type != BPF_PROG_TYPE_CGROUP_SKB)
    45			return NULL;
    46	
  > 47		cgrp = task_dfl_cgroup(current);
    48	
    49		item = bpf_prog_find_active(prog,
  > 50					    cgrp->bpf.effective[BPF_CGROUP_INET_INGRESS]);
    51		if (!item)
    52			item = bpf_prog_find_active(prog,
    53						    cgrp->bpf.effective[BPF_CGROUP_INET_EGRESS]);
    54	
    55		return item ? item->cgroup_storage : NULL;
    56	}
    57	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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