linux-kernel - [jolsa-perf:bpf/fixes 2/5] include/linux/kallsyms.h:107:5: warning: no previous prototype for function 'kallsyms_lookup

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Date:   Fri, 8 Apr 2022 07:39:31 +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/fixes 2/5] include/linux/kallsyms.h:107:5: warning:
 no previous prototype for function 'kallsyms_lookup_names'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/fixes
head:   baa78873a24a7e0f21b0a01e82214ce9a096e147
commit: 3f047c53b0e7e747b76f0b3d032e476efbe1222f [2/5] kallsyms: Add kallsyms_lookup_names function
config: powerpc-mpc8313_rdb_defconfig (https://download.01.org/0day-ci/archive/20220408/202204080713.3jWhtN6s-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6b306233f78876a1d197ed6e1f05785505de7c63)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=3f047c53b0e7e747b76f0b3d032e476efbe1222f
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/fixes
        git checkout 3f047c53b0e7e747b76f0b3d032e476efbe1222f
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc prepare

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

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/kernel/asm-offsets.c:36:
   In file included from arch/powerpc/include/asm/dbell.h:17:
   In file included from arch/powerpc/include/asm/kvm_ppc.h:19:
   In file included from include/linux/kvm_host.h:32:
   In file included from include/linux/ftrace.h:12:
>> include/linux/kallsyms.h:107:5: warning: no previous prototype for function 'kallsyms_lookup_names' [-Wmissing-prototypes]
   int kallsyms_lookup_names(const char **syms, u32 cnt, unsigned long *addrs)
       ^
   include/linux/kallsyms.h:107:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int kallsyms_lookup_names(const char **syms, u32 cnt, unsigned long *addrs)
   ^
   static 
   1 warning generated.
   /usr/bin/ld: unrecognised emulation mode: elf32ppclinux
   Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu elf_l1om elf_k1om i386pep i386pe
   clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
   make[2]: *** [arch/powerpc/kernel/vdso/Makefile:65: arch/powerpc/kernel/vdso/vdso32.so.dbg] Error 1
   make[2]: Target 'include/generated/vdso32-offsets.h' not remade because of errors.
   make[1]: *** [arch/powerpc/Makefile:423: vdso_prepare] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/kallsyms_lookup_names +107 include/linux/kallsyms.h

   106	
 > 107	int kallsyms_lookup_names(const char **syms, u32 cnt, unsigned long *addrs)
   108	{
   109		return -ERANGE;
   110	}
   111	

-- 
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https://01.org/lkp