Hi Alexei,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Alexei-Starovoitov/bpf-Introduce-bpf_timer/20210522-204413
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: m68k-randconfig-r012-20210522 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
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/0day-ci/linux/commit/9380db20bb780c2f5147a795ac7f5fc133f66d55
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alexei-Starovoitov/bpf-Introduce-bpf_timer/20210522-204413
        git checkout 9380db20bb780c2f5147a795ac7f5fc133f66d55
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

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/helpers.c: In function 'timer_cb':
   kernel/bpf/helpers.c:1000:18: warning: unused variable 'map' [-Wunused-variable]
    1000 |  struct bpf_map *map;
         |                  ^~~
   kernel/bpf/helpers.c: In function '____bpf_timer_mod':
>> kernel/bpf/helpers.c:1043:7: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    1043 |  tl = (struct bpf_timer_list *)timer->opaque;
         |       ^
   kernel/bpf/helpers.c: In function '____bpf_timer_del':
   kernel/bpf/helpers.c:1068:7: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    1068 |  tl = (struct bpf_timer_list *)timer->opaque;
         |       ^


vim +1043 kernel/bpf/helpers.c

  1038	
  1039	BPF_CALL_2(bpf_timer_mod, struct bpf_timer *, timer, u64, msecs)
  1040	{
  1041		struct bpf_timer_list *tl;
  1042	
> 1043		tl = (struct bpf_timer_list *)timer->opaque;
  1044		if (!tl)
  1045			return -EINVAL;
  1046		/* keep the prog alive until callback is invoked */
  1047		if (!mod_timer(&tl->tl, jiffies + msecs_to_jiffies(msecs))) {
  1048			/* The timer was inactive.
  1049			 * Keep the prog alive until callback is invoked
  1050			 */
  1051			bpf_prog_inc(tl->prog);
  1052		}
  1053		return 0;
  1054	}
  1055	

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