linux-kernel - [jolsa-perf:bpf/tramp_22 21/21] 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

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Message-ID: <202207061102.sgu5KQzw-lkp@intel.com>
Date:   Wed, 6 Jul 2022 11:48:00 +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_22 21/21] 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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tramp_22
head:   1d891c46bb689a24985cea58f4eddb053d6b1331
commit: 1d891c46bb689a24985cea58f4eddb053d6b1331 [21/21] bpf: Add support to attach multi trampolines
config: x86_64-randconfig-a012 (https://download.01.org/0day-ci/archive/20220706/202207061102.sgu5KQzw-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 142aca7741d5b06207e87bf4880fbe308c8d6823)
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=1d891c46bb689a24985cea58f4eddb053d6b1331
        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_22
        git checkout 1d891c46bb689a24985cea58f4eddb053d6b1331
        # 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: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:3307:7: 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:3307:5: 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:3348:8: 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:3348:8: note: did you mean 'bpf_tracing_multi_attach'?
   kernel/bpf/syscall.c:3292:12: note: 'bpf_tracing_multi_attach' declared here
   static int bpf_tracing_multi_attach(struct bpf_prog *prog,
              ^
   1 warning and 3 errors generated.


vim +/bpf_trampoline_multi_detach +3137 kernel/bpf/syscall.c

  3131	
  3132	static void bpf_tracing_multi_link_release(struct bpf_link *link)
  3133	{
  3134		struct bpf_tracing_multi_link *tr_link =
  3135			container_of(link, struct bpf_tracing_multi_link, link);
  3136	
> 3137		WARN_ON_ONCE(bpf_trampoline_multi_detach(&tr_link->tp, tr_link->id));
  3138	}
  3139	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp