linux-kernel - net/core/filter.c:11773:17: warning: no previous declaration for 'bpf_sock_addr_set_sun

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Date:   Thu, 2 Nov 2023 12:14:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     Daan De Meyer <daan.j.demeyer@...il.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Martin KaFai Lau <martin.lau@...nel.org>
Subject: net/core/filter.c:11773:17: warning: no previous declaration for
 'bpf_sock_addr_set_sun_path'

Hi Daan,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   babe393974de0351c0e6cca50f5f84edaf8d7fa1
commit: 53e380d21441909b12b6e0782b77187ae4b971c4 bpf: Add bpf_sock_addr_set_sun_path() to allow writing unix sockaddr from bpf
date:   3 weeks ago
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20231102/202311021257.nD9pHYSn-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231102/202311021257.nD9pHYSn-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311021257.nD9pHYSn-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/core/filter.c:11747:17: warning: no previous declaration for 'bpf_dynptr_from_skb' [-Wmissing-declarations]
    __bpf_kfunc int bpf_dynptr_from_skb(struct sk_buff *skb, u64 flags,
                    ^~~~~~~~~~~~~~~~~~~
   net/core/filter.c:11760:17: warning: no previous declaration for 'bpf_dynptr_from_xdp' [-Wmissing-declarations]
    __bpf_kfunc int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags,
                    ^~~~~~~~~~~~~~~~~~~
>> net/core/filter.c:11773:17: warning: no previous declaration for 'bpf_sock_addr_set_sun_path' [-Wmissing-declarations]
    __bpf_kfunc int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern *sa_kern,
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~
   net/core/filter.c:11877:17: warning: no previous declaration for 'bpf_sock_destroy' [-Wmissing-declarations]
    __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)
                    ^~~~~~~~~~~~~~~~


vim +/bpf_sock_addr_set_sun_path +11773 net/core/filter.c

 11772	
 11773	__bpf_kfunc int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern *sa_kern,
 11774						   const u8 *sun_path, u32 sun_path__sz)
 11775	{
 11776		struct sockaddr_un *un;
 11777	
 11778		if (sa_kern->sk->sk_family != AF_UNIX)
 11779			return -EINVAL;
 11780	
 11781		/* We do not allow changing the address to unnamed or larger than the
 11782		 * maximum allowed address size for a unix sockaddr.
 11783		 */
 11784		if (sun_path__sz == 0 || sun_path__sz > UNIX_PATH_MAX)
 11785			return -EINVAL;
 11786	
 11787		un = (struct sockaddr_un *)sa_kern->uaddr;
 11788		memcpy(un->sun_path, sun_path, sun_path__sz);
 11789		sa_kern->uaddrlen = offsetof(struct sockaddr_un, sun_path) + sun_path__sz;
 11790	
 11791		return 0;
 11792	}
 11793	__diag_pop();
 11794	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki