Hi Florent,

I love your patch! Perhaps something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Florent-Revest/bpf-Add-a-ARG_PTR_TO_CONST_STR-argument-type/20210311-070306
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-s022-20210310 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-262-g5e674421-dirty
        # https://github.com/0day-ci/linux/commit/c06d419a45370b897b7383625f0435873a7458fa
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Florent-Revest/bpf-Add-a-ARG_PTR_TO_CONST_STR-argument-type/20210311-070306
        git checkout c06d419a45370b897b7383625f0435873a7458fa
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


"sparse warnings: (new ones prefixed by >>)"
>> kernel/bpf/verifier.c:5735:5: sparse: sparse: symbol 'check_bpf_snprintf_call' was not declared. Should it be static?
   kernel/bpf/verifier.c:11865:76: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12273:81: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12277:81: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12281:81: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12285:79: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12289:78: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12293:79: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12297:78: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/verifier.c:12341:38: sparse: sparse: subtraction of functions? Share your drugs

Please review and possibly fold the followup patch.

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