Re: [PATCH bpf-next v1 6/7] bpf: Dynptr support for ring buffers

[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/Dynamic-pointers/20220402-100110
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20220402/202204021459.6f2G1oTF-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 11.2.0
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/64c5b9e2d2df7ff61dd8bd2e36a29ffff264e2ff
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Joanne-Koong/Dynamic-pointers/20220402-100110
        git checkout 64c5b9e2d2df7ff61dd8bd2e36a29ffff264e2ff
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash kernel/bpf/

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

All warnings (new ones prefixed by >>):

   kernel/bpf/ringbuf.c: In function '____bpf_ringbuf_reserve_dynptr':
>> kernel/bpf/ringbuf.c:491:18: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     491 |         sample = (void *)____bpf_ringbuf_reserve(map, size, flags);
         |                  ^


vim +491 kernel/bpf/ringbuf.c

   478	
   479	BPF_CALL_4(bpf_ringbuf_reserve_dynptr, struct bpf_map *, map, u32, size, u64, flags,
   480		   struct bpf_dynptr_kern *, ptr)
   481	{
   482		void *sample;
   483		int err;
   484	
   485		err = bpf_dynptr_check_size(size);
   486		if (err) {
   487			bpf_dynptr_set_null(ptr);
   488			return err;
   489		}
   490	
 > 491		sample = (void *)____bpf_ringbuf_reserve(map, size, flags);
   492	
   493		if (!sample) {
   494			bpf_dynptr_set_null(ptr);
   495			return -EINVAL;
   496		}
   497	
   498		bpf_dynptr_init(ptr, sample, BPF_DYNPTR_TYPE_RINGBUF, 0, size);
   499	
   500		return 0;
   501	}
   502	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp