linux-kernel - [jolsa-perf:bpf/tramp_27 25/33] kernel/bpf/syscall.c:3145:2: error: call to undeclared function 'bpf_tramp_id_put'; ISO C99 and later do not support implicit function declarations

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Date:   Mon, 11 Jul 2022 04:11:39 +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 25/33] kernel/bpf/syscall.c:3145:2: error:
 call to undeclared function 'bpf_tramp_id_put'; 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: 09c2a865c50223e0a31377f51bd567e5d5943e73 [25/33] bpf: Add support for tracing multi link
config: x86_64-randconfig-a012 (https://download.01.org/0day-ci/archive/20220711/202207110453.fdFb8WAD-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=09c2a865c50223e0a31377f51bd567e5d5943e73
        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 09c2a865c50223e0a31377f51bd567e5d5943e73
        # 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=x86_64 SHELL=/bin/bash

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/syscall.c:2503:15: error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           multi_func = is_tracing_multi(attr->expected_attach_type);
                        ^
   kernel/bpf/syscall.c:3137:15: error: call to undeclared function 'bpf_trampoline_multi_detach'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           WARN_ON_ONCE(bpf_trampoline_multi_detach(&tr_link->tp, tr_link->id));
                        ^
>> kernel/bpf/syscall.c:3145:2: error: call to undeclared function 'bpf_tramp_id_put'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           bpf_tramp_id_put(tr_link->id);
           ^
   kernel/bpf/syscall.c:3145:2: note: did you mean 'bpf_trampoline_put'?
   include/linux/bpf.h:1013:20: note: 'bpf_trampoline_put' declared here
   static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
                      ^
   kernel/bpf/syscall.c:3308:7: error: call to undeclared function 'bpf_tramp_id_alloc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           id = bpf_tramp_id_alloc(cnt);
                ^
   kernel/bpf/syscall.c:3308:5: warning: incompatible integer to pointer conversion assigning to 'struct bpf_tramp_id *' from 'int' [-Wint-conversion]
           id = bpf_tramp_id_alloc(cnt);
              ^ ~~~~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/syscall.c:3349:8: error: call to undeclared function 'bpf_trampoline_multi_attach'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           err = bpf_trampoline_multi_attach(&link->tp, id);
                 ^
   kernel/bpf/syscall.c:3349:8: note: did you mean 'bpf_tracing_multi_attach'?
   kernel/bpf/syscall.c:3293:12: note: 'bpf_tracing_multi_attach' declared here
   static int bpf_tracing_multi_attach(struct bpf_prog *prog,
              ^
   kernel/bpf/syscall.c:4821:12: error: call to undeclared function 'is_tracing_multi'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   else if (is_tracing_multi(prog->expected_attach_type))
                            ^
   1 warning and 6 errors generated.


vim +/bpf_tramp_id_put +3145 kernel/bpf/syscall.c

  3139	
  3140	static void bpf_tracing_multi_link_dealloc(struct bpf_link *link)
  3141	{
  3142		struct bpf_tracing_multi_link *tr_link =
  3143			container_of(link, struct bpf_tracing_multi_link, link);
  3144	
> 3145		bpf_tramp_id_put(tr_link->id);
  3146		kfree(tr_link);
  3147	}
  3148	

-- 
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https://01.org/lkp