linux-kernel - [jolsa-perf:bpf/tramp_27 24/33] kernel/bpf/trampoline.c:315:14: error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do not support implicit function declarations

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Date:   Mon, 11 Jul 2022 03:10:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [jolsa-perf:bpf/tramp_27 24/33] kernel/bpf/trampoline.c:315:14:
 error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do
 not support implicit function declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tramp_27
head:   08201713df8992b94d140b43fd4f20f1ad4aedb3
commit: 83e7574907cf2bdc5e551a6e39a2b897d0830062 [24/33] bpf: Add support to attach multi trampolines
config: arm-randconfig-r021-20220710 (https://download.01.org/0day-ci/archive/20220711/202207110343.uPXNDCd7-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6ce63e267aab79ca87bf63453d34dd3909ab978d)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=83e7574907cf2bdc5e551a6e39a2b897d0830062
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/tramp_27
        git checkout 83e7574907cf2bdc5e551a6e39a2b897d0830062
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> kernel/bpf/trampoline.c:315:14: error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                           *multi |= is_tracing_multi(prog->expected_attach_type);
                                     ^
   kernel/bpf/trampoline.c:947:9: error: call to undeclared function 'ftrace_hash_alloc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
                  ^
   kernel/bpf/trampoline.c:947:27: error: use of undeclared identifier 'FTRACE_HASH_MAX_BITS'
           hash = ftrace_hash_alloc(FTRACE_HASH_MAX_BITS);
                                    ^
   kernel/bpf/trampoline.c:974:5: error: call to undeclared function 'ftrace_hash_add_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                                   ftrace_hash_add_entry(hash, entry);
                                   ^
   kernel/bpf/trampoline.c:984:4: error: call to undeclared function 'ftrace_hash_add_entry'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                           ftrace_hash_add_entry(hash, entry);
                           ^
   kernel/bpf/trampoline.c:988:8: error: call to undeclared function 'set_ftrace_direct'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           err = set_ftrace_direct(hash);
                 ^
   kernel/bpf/trampoline.c:990:2: error: call to undeclared function 'ftrace_hash_free'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           ftrace_hash_free(hash);
           ^
   7 errors generated.


vim +/is_tracing_multi +315 kernel/bpf/trampoline.c

   287	
   288	static struct bpf_tramp_progs *
   289	bpf_trampoline_get_progs(const struct bpf_trampoline *tr, int *total, bool *ip_arg, bool *multi)
   290	{
   291		const struct bpf_prog_array_item *item;
   292		struct bpf_prog_array *prog_array;
   293		struct bpf_tramp_progs *tprogs;
   294		struct bpf_tramp_prog *tp;
   295		struct bpf_prog *prog;
   296		int kind;
   297	
   298		*total = 0;
   299		tprogs = kcalloc(BPF_TRAMP_MAX, sizeof(*tprogs), GFP_KERNEL);
   300		if (!tprogs)
   301			return ERR_PTR(-ENOMEM);
   302	
   303		for (kind = 0; kind < BPF_TRAMP_MAX; kind++) {
   304			tprogs[kind].nr_progs = tr->progs_cnt[kind];
   305			*total += tr->progs_cnt[kind];
   306			tp = &tprogs[kind].progs[0];
   307	
   308			prog_array = tr->progs_array[kind];
   309			if (!prog_array)
   310				continue;
   311			item = &prog_array->items[0];
   312	
   313			while ((prog = READ_ONCE(item->prog))) {
   314				*ip_arg |= prog->call_get_func_ip;
 > 315				*multi |= is_tracing_multi(prog->expected_attach_type);
   316				tp->prog = prog;
   317				tp->cookie = item->bpf_cookie;
   318				tp++; item++;
   319			}
   320		}
   321		return tprogs;
   322	}
   323	

-- 
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https://01.org/lkp