[jolsa-perf:bpf/fprobe_link_5 3/10] kernel/bpf/syscall.c:4337: undefined reference to `bpf_fprobe_link_attach'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/fprobe_link_5
head:   9149abfa25286fdf715525babec5150939c9ac96
commit: 32adbf1760d4cccb9702863371d50b625ae7ee1d [3/10] bpf: Add support to attach kprobe program with fprobe
config: i386-randconfig-c021 (https://download.01.org/0day-ci/archive/20220214/202202140713.Pklmh3QR-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=32adbf1760d4cccb9702863371d50b625ae7ee1d
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/fprobe_link_5
        git checkout 32adbf1760d4cccb9702863371d50b625ae7ee1d
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   ld: kernel/bpf/syscall.o: in function `link_create':
>> kernel/bpf/syscall.c:4337: undefined reference to `bpf_fprobe_link_attach'


vim +4337 kernel/bpf/syscall.c

  4258	
  4259	#define BPF_LINK_CREATE_LAST_FIELD link_create.fprobe.flags
  4260	static int link_create(union bpf_attr *attr, bpfptr_t uattr)
  4261	{
  4262		enum bpf_prog_type ptype;
  4263		struct bpf_prog *prog;
  4264		int ret;
  4265	
  4266		if (CHECK_ATTR(BPF_LINK_CREATE))
  4267			return -EINVAL;
  4268	
  4269		prog = bpf_prog_get(attr->link_create.prog_fd);
  4270		if (IS_ERR(prog))
  4271			return PTR_ERR(prog);
  4272	
  4273		ret = bpf_prog_attach_check_attach_type(prog,
  4274							attr->link_create.attach_type);
  4275		if (ret)
  4276			goto out;
  4277	
  4278		switch (prog->type) {
  4279		case BPF_PROG_TYPE_EXT:
  4280			ret = tracing_bpf_link_attach(attr, uattr, prog);
  4281			goto out;
  4282		case BPF_PROG_TYPE_PERF_EVENT:
  4283		case BPF_PROG_TYPE_TRACEPOINT:
  4284			if (attr->link_create.attach_type != BPF_PERF_EVENT) {
  4285				ret = -EINVAL;
  4286				goto out;
  4287			}
  4288			ptype = prog->type;
  4289			break;
  4290		case BPF_PROG_TYPE_KPROBE:
  4291			if (attr->link_create.attach_type != BPF_PERF_EVENT &&
  4292			    attr->link_create.attach_type != BPF_TRACE_FPROBE) {
  4293				ret = -EINVAL;
  4294				goto out;
  4295			}
  4296			ptype = prog->type;
  4297			break;
  4298		default:
  4299			ptype = attach_type_to_prog_type(attr->link_create.attach_type);
  4300			if (ptype == BPF_PROG_TYPE_UNSPEC || ptype != prog->type) {
  4301				ret = -EINVAL;
  4302				goto out;
  4303			}
  4304			break;
  4305		}
  4306	
  4307		switch (ptype) {
  4308		case BPF_PROG_TYPE_CGROUP_SKB:
  4309		case BPF_PROG_TYPE_CGROUP_SOCK:
  4310		case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
  4311		case BPF_PROG_TYPE_SOCK_OPS:
  4312		case BPF_PROG_TYPE_CGROUP_DEVICE:
  4313		case BPF_PROG_TYPE_CGROUP_SYSCTL:
  4314		case BPF_PROG_TYPE_CGROUP_SOCKOPT:
  4315			ret = cgroup_bpf_link_attach(attr, prog);
  4316			break;
  4317		case BPF_PROG_TYPE_TRACING:
  4318			ret = tracing_bpf_link_attach(attr, uattr, prog);
  4319			break;
  4320		case BPF_PROG_TYPE_FLOW_DISSECTOR:
  4321		case BPF_PROG_TYPE_SK_LOOKUP:
  4322			ret = netns_bpf_link_create(attr, prog);
  4323			break;
  4324	#ifdef CONFIG_NET
  4325		case BPF_PROG_TYPE_XDP:
  4326			ret = bpf_xdp_link_attach(attr, prog);
  4327			break;
  4328	#endif
  4329		case BPF_PROG_TYPE_PERF_EVENT:
  4330		case BPF_PROG_TYPE_TRACEPOINT:
  4331			ret = bpf_perf_link_attach(attr, prog);
  4332			break;
  4333		case BPF_PROG_TYPE_KPROBE:
  4334			if (attr->link_create.attach_type == BPF_PERF_EVENT)
  4335				ret = bpf_perf_link_attach(attr, prog);
  4336			else
> 4337				ret = bpf_fprobe_link_attach(attr, prog);
  4338			break;
  4339		default:
  4340			ret = -EINVAL;
  4341		}
  4342	
  4343	out:
  4344		if (ret < 0)
  4345			bpf_prog_put(prog);
  4346		return ret;
  4347	}
  4348	

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