[jolsa-perf:bpf/tracing_multi_4 7/13] kernel/bpf/trampoline.c:527:14: error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tracing_multi_4
head:   a3f496c783e26237e1a9a5b1f5e6661d4e3c5f25
commit: cbb350ed40eb90b612d359931c72378a8dcc718b [7/13] bpf: Add bpf_trampoline_multi_attach/detach functions
config: i386-randconfig-002-20260212 (https://download.01.org/0day-ci/archive/20260212/202602120809.ddpbx5h9-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260212/202602120809.ddpbx5h9-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/202602120809.ddpbx5h9-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/bpf/trampoline.c:527:14: error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     527 |                         *multi |= is_tracing_multi(node->link->prog->expected_attach_type);
         |                                   ^
   1 error generated.


vim +/is_tracing_multi +527 kernel/bpf/trampoline.c

   507	
   508	static struct bpf_tramp_nodes *
   509	bpf_trampoline_get_progs(const struct bpf_trampoline *tr, int *total, bool *ip_arg, bool *multi)
   510	{
   511		struct bpf_tramp_node *node, **nodes;
   512		struct bpf_tramp_nodes *tnodes;
   513		int kind;
   514	
   515		*total = 0;
   516		tnodes = kcalloc(BPF_TRAMP_MAX, sizeof(*tnodes), GFP_KERNEL);
   517		if (!tnodes)
   518			return ERR_PTR(-ENOMEM);
   519	
   520		for (kind = 0; kind < BPF_TRAMP_MAX; kind++) {
   521			tnodes[kind].nr_nodes = tr->progs_cnt[kind];
   522			*total += tr->progs_cnt[kind];
   523			nodes = tnodes[kind].nodes;
   524	
   525			hlist_for_each_entry(node, &tr->progs_hlist[kind], tramp_hlist) {
   526				*ip_arg |= node->link->prog->call_get_func_ip;
 > 527				*multi |= is_tracing_multi(node->link->prog->expected_attach_type);
   528				*nodes++ = node;
   529			}
   530		}
   531		return tnodes;
   532	}
   533	

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