Re: [PATCH v1 bpf] bpf: Free reuseport cBPF prog after RCU grace period.

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

Hi Kuniyuki,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Kuniyuki-Iwashima/bpf-Free-reuseport-cBPF-prog-after-RCU-grace-period/20260425-093050
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
patch link:    https://lore.kernel.org/r/20260424235247.1990272-1-kuniyu%40google.com
patch subject: [PATCH v1 bpf] bpf: Free reuseport cBPF prog after RCU grace period.
config: x86_64-rhel-9.4-ltp (https://download.01.org/0day-ci/archive/20260506/202605062104.y7Xps52z-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260506/202605062104.y7Xps52z-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/202605062104.y7Xps52z-lkp@intel.com/

All errors (new ones prefixed by >>):

>> net/core/filter.c:1666:6: error: conflicting types for 'sk_reuseport_prog_free'; have 'void(struct bpf_prog *, bool)' {aka 'void(struct bpf_prog *, _Bool)'}
    1666 | void sk_reuseport_prog_free(struct bpf_prog *prog, bool wait_rcu)
         |      ^~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/bpf_verifier.h:9,
                    from net/core/filter.c:21:
   include/linux/filter.h:1146:6: note: previous declaration of 'sk_reuseport_prog_free' with type 'void(struct bpf_prog *)'
    1146 | void sk_reuseport_prog_free(struct bpf_prog *prog);
         |      ^~~~~~~~~~~~~~~~~~~~~~


vim +1666 net/core/filter.c

  1665	
> 1666	void sk_reuseport_prog_free(struct bpf_prog *prog, bool wait_rcu)
  1667	{
  1668		if (!prog)
  1669			return;
  1670	
  1671		if (bpf_prog_was_classic(prog))
  1672			call_rcu(&prog->aux->rcu, sk_reuseport_prog_free_rcu);
  1673		else
  1674			bpf_prog_put(prog);
  1675	}
  1676	

--
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