arch/x86/entry/vdso/vdso32/../vgetcpu.c:13:1: error: no previous prototype for '__vdso_getcpu'

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

Hi Sebastian,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   825a0714d2b3883d4f8ff64f6933fb73ee3f1834
commit: 92d33063c081a82d25dd08a9cce03947c8ed9164 x86/vdso: Provide getcpu for x86-32.
date:   3 months ago
config: x86_64-sof-customedconfig-edison-defconfig (https://download.01.org/0day-ci/archive/20230430/202304302304.LTYndwk9-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=92d33063c081a82d25dd08a9cce03947c8ed9164
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 92d33063c081a82d25dd08a9cce03947c8ed9164
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make 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@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304302304.LTYndwk9-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/entry/vdso/vdso32/vgetcpu.c:2:
>> arch/x86/entry/vdso/vdso32/../vgetcpu.c:13:1: error: no previous prototype for '__vdso_getcpu' [-Werror=missing-prototypes]
      13 | __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
         | ^~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/__vdso_getcpu +13 arch/x86/entry/vdso/vdso32/../vgetcpu.c

2aae950b21e4bc arch/x86_64/vdso/vgetcpu.c    Andi Kleen     2007-07-21  11  
23adec554a7648 arch/x86/vdso/vgetcpu.c       Steven Rostedt 2008-05-12  12  notrace long
23adec554a7648 arch/x86/vdso/vgetcpu.c       Steven Rostedt 2008-05-12 @13  __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
2aae950b21e4bc arch/x86_64/vdso/vgetcpu.c    Andi Kleen     2007-07-21  14  {
22245bdf0ad805 arch/x86/entry/vdso/vgetcpu.c Ingo Molnar    2018-10-08  15  	vdso_read_cpunode(cpu, node);
ec3a94188df7d2 arch/x86/entry/vdso/vgetcpu.c Ingo Molnar    2018-10-08  16  
2aae950b21e4bc arch/x86_64/vdso/vgetcpu.c    Andi Kleen     2007-07-21  17  	return 0;
2aae950b21e4bc arch/x86_64/vdso/vgetcpu.c    Andi Kleen     2007-07-21  18  }
2aae950b21e4bc arch/x86_64/vdso/vgetcpu.c    Andi Kleen     2007-07-21  19  

:::::: The code at line 13 was first introduced by commit
:::::: 23adec554a7648f99c8acc0caf49c66320cd2b84 x86: add notrace annotations to vsyscall.

:::::: TO: Steven Rostedt <srostedt@redhat.com>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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https://github.com/intel/lkp-tests