Re: [PATCH bpf-next 3/4] bpf: export some cgroup storages allocation helpers for reusing

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

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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: x86_64-rhel-7.6 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   net/bpf/test_run.c: In function 'bpf_test_run':
>> net/bpf/test_run.c:26:8: error: implicit declaration of function 'bpf_cgroup_storages_alloc'; did you mean 'bpf_cgroup_storage_alloc'? [-Werror=implicit-function-declaration]
      26 |  ret = bpf_cgroup_storages_alloc(storage, prog);
         |        ^~~~~~~~~~~~~~~~~~~~~~~~~
         |        bpf_cgroup_storage_alloc
>> net/bpf/test_run.c:68:2: error: implicit declaration of function 'bpf_cgroup_storages_free'; did you mean 'bpf_cgroup_storage_free'? [-Werror=implicit-function-declaration]
      68 |  bpf_cgroup_storages_free(storage);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~
         |  bpf_cgroup_storage_free
   cc1: some warnings being treated as errors

vim +26 net/bpf/test_run.c

    17	
    18	static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
    19				u32 *retval, u32 *time, bool xdp)
    20	{
    21		struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
    22		u64 time_start, time_spent = 0;
    23		int ret = 0;
    24		u32 i;
    25	
  > 26		ret = bpf_cgroup_storages_alloc(storage, prog);
    27		if (ret)
    28			return ret;
    29	
    30		if (!repeat)
    31			repeat = 1;
    32	
    33		rcu_read_lock();
    34		migrate_disable();
    35		time_start = ktime_get_ns();
    36		for (i = 0; i < repeat; i++) {
    37			bpf_cgroup_storage_set(storage);
    38	
    39			if (xdp)
    40				*retval = bpf_prog_run_xdp(prog, ctx);
    41			else
    42				*retval = BPF_PROG_RUN(prog, ctx);
    43	
    44			if (signal_pending(current)) {
    45				ret = -EINTR;
    46				break;
    47			}
    48	
    49			if (need_resched()) {
    50				time_spent += ktime_get_ns() - time_start;
    51				migrate_enable();
    52				rcu_read_unlock();
    53	
    54				cond_resched();
    55	
    56				rcu_read_lock();
    57				migrate_disable();
    58				time_start = ktime_get_ns();
    59			}
    60		}
    61		time_spent += ktime_get_ns() - time_start;
    62		migrate_enable();
    63		rcu_read_unlock();
    64	
    65		do_div(time_spent, repeat);
    66		*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
    67	
  > 68		bpf_cgroup_storages_free(storage);
    69	
    70		return ret;
    71	}
    72	

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

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