Re: [PATCH v2 bpf] bpf: Fix remap of arena.

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

Hi Alexei,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexei-Starovoitov/bpf-Fix-remap-of-arena/20240618-012054
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
patch link:    https://lore.kernel.org/r/20240617171812.76634-1-alexei.starovoitov%40gmail.com
patch subject: [PATCH v2 bpf] bpf: Fix remap of arena.
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20240618/202406181248.u80sRLXy-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240618/202406181248.u80sRLXy-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406181248.u80sRLXy-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/bpf/arena.c: In function 'arena_vm_open':
>> kernel/bpf/arena.c:235:27: warning: unused variable 'arena' [-Wunused-variable]
     235 |         struct bpf_arena *arena = container_of(map, struct bpf_arena, map);
         |                           ^~~~~


vim +/arena +235 kernel/bpf/arena.c

   231	
   232	static void arena_vm_open(struct vm_area_struct *vma)
   233	{
   234		struct bpf_map *map = vma->vm_file->private_data;
 > 235		struct bpf_arena *arena = container_of(map, struct bpf_arena, map);
   236		struct vma_list *vml = vma->vm_private_data;
   237	
   238		atomic_inc(&vml->mmap_count);
   239	}
   240	

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