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! 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: x86_64-randconfig-s022-20200714 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-41-g14e84ffc-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


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:50:56: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected struct bpf_prog_array *[addressable] effective @@     got struct bpf_prog_array [noderef] __rcu * @@
>> net/bpf/test_run.c:50:56: sparse:     expected struct bpf_prog_array *[addressable] effective
>> net/bpf/test_run.c:50:56: sparse:     got struct bpf_prog_array [noderef] __rcu *
   net/bpf/test_run.c:53:64: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected struct bpf_prog_array *[addressable] effective @@     got struct bpf_prog_array [noderef] __rcu * @@
   net/bpf/test_run.c:53:64: sparse:     expected struct bpf_prog_array *[addressable] effective
   net/bpf/test_run.c:53:64: sparse:     got struct bpf_prog_array [noderef] __rcu *

vim +50 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
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Attachment: .config.gz
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