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

[kernel test robot <lkp@intel.com>]

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Hi Dmitry,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING 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: microblaze-randconfig-s031-20200714 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
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: v0.6.2-41-g14e84ffc-dirty
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=microblaze 

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


sparse warnings: (new ones prefixed by >>)

>> net/bpf/test_run.c:25:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> net/bpf/test_run.c:25:17: sparse:    struct bpf_prog_array [noderef] __rcu *
>> net/bpf/test_run.c:25:17: sparse:    struct bpf_prog_array *
   net/bpf/test_run.c:50:46: sparse: sparse: using member 'effective' in incomplete struct cgroup_bpf
   net/bpf/test_run.c:53:54: sparse: sparse: using member 'effective' in incomplete struct cgroup_bpf
   net/bpf/test_run.c:67:15: sparse: sparse: undefined identifier 'bpf_cgroup_storages_alloc'
   net/bpf/test_run.c:115:9: sparse: sparse: undefined identifier 'bpf_cgroup_storages_free'

vim +25 net/bpf/test_run.c

    17	
    18	static struct bpf_prog_array_item *bpf_prog_find_active(struct bpf_prog *prog,
    19								struct bpf_prog_array *effective)
    20	{
    21		struct bpf_prog_array_item *item;
    22		struct bpf_prog_array *array;
    23		struct bpf_prog *p;
    24	
  > 25		array = rcu_dereference(effective);
    26		if (!array)
    27			return NULL;
    28	
    29		item = &array->items[0];
    30		while ((p = READ_ONCE(item->prog))) {
    31			if (p == prog)
    32				return item;
    33			item++;
    34		}
    35	
    36		return NULL;
    37	}
    38	

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

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