Re: [PATCH v8 bpf-next 4/5] bpf: Add xdp dynptrs

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

Hi Joanne,

Thank you for the patch! Perhaps something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Joanne-Koong/bpf-Allow-sk_buff-and-xdp_buff-as-valid-kfunc-arg-types/20230128-170947
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20230126233439.3739120-5-joannelkoong%40gmail.com
patch subject: [PATCH v8 bpf-next 4/5] bpf: Add xdp dynptrs
config: ia64-allyesconfig (https://download.01.org/0day-ci/archive/20230128/202301282216.D4fgHBjZ-lkp@intel.com/config)
compiler: ia64-linux-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/ca213ec890479169ac6661c55e4c3eb95b4d8464
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Joanne-Koong/bpf-Allow-sk_buff-and-xdp_buff-as-valid-kfunc-arg-types/20230128-170947
        git checkout ca213ec890479169ac6661c55e4c3eb95b4d8464
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=ia64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=ia64 SHELL=/bin/bash net/core/

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

All warnings (new ones prefixed by >>):

   net/core/filter.c:1866:5: warning: no previous prototype for 'bpf_dynptr_from_skb' [-Wmissing-prototypes]
    1866 | int bpf_dynptr_from_skb(struct sk_buff *skb, u64 flags,
         |     ^~~~~~~~~~~~~~~~~~~
>> net/core/filter.c:3858:5: warning: no previous prototype for 'bpf_dynptr_from_xdp' [-Wmissing-prototypes]
    3858 | int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags, struct bpf_dynptr_kern *ptr)
         |     ^~~~~~~~~~~~~~~~~~~


vim +/bpf_dynptr_from_xdp +3858 net/core/filter.c

  3857	
> 3858	int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags, struct bpf_dynptr_kern *ptr)
  3859	{
  3860		if (flags) {
  3861			bpf_dynptr_set_null(ptr);
  3862			return -EINVAL;
  3863		}
  3864	
  3865		bpf_dynptr_init(ptr, xdp, BPF_DYNPTR_TYPE_XDP, 0, xdp_get_buff_len(xdp));
  3866	
  3867		return 0;
  3868	}
  3869	

-- 
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https://github.com/intel/lkp-tests