Re: [PATCH bpf-next 1/2] bpf: enable the "open" operator on a pinned path of a struct_osp link.

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

Hi Kui-Feng,

kernel test robot noticed the following build errors:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Kui-Feng-Lee/bpf-enable-the-open-operator-on-a-pinned-path-of-a-struct_osp-link/20240417-082736
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20240417002513.1534535-2-thinker.li%40gmail.com
patch subject: [PATCH bpf-next 1/2] bpf: enable the "open" operator on a pinned path of a struct_osp link.
config: arm-aspeed_g5_defconfig (https://download.01.org/0day-ci/archive/20240418/202404181413.1uMDy1xi-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240418/202404181413.1uMDy1xi-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/202404181413.1uMDy1xi-lkp@intel.com/

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: kernel/bpf/syscall.o: in function `bpf_link_open':
>> kernel/bpf/syscall.c:3117:(.text+0xb70): undefined reference to `bpffs_struct_ops_link_open'


vim +3117 kernel/bpf/syscall.c

  3110	
  3111	/* Support opening pinned links */
  3112	static int bpf_link_open(struct inode *inode, struct file *filp)
  3113	{
  3114		struct bpf_link *link = inode->i_private;
  3115	
  3116		if (link->type == BPF_LINK_TYPE_STRUCT_OPS)
> 3117			return bpffs_struct_ops_link_open(inode, filp);
  3118	
  3119		return -EOPNOTSUPP;
  3120	}
  3121	

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