[mingo-tip:sched/headers 1952/2579] arch/x86/entry/vdso/vdso32-setup.c:55:12: warning: no previous prototype for 'sysenter_setup'

[mingo-tip:sched/headers 1952/2579] arch/x86/entry/vdso/vdso32-setup.c:55:12: warning: no previous prototype for 'sysenter_setup'

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   49e1ec6c70a6eb4b7de9250a455b8b63eb42afbe
commit: 143f41d47c158e8acbbce44c87a78966d3e9f62f [1952/2579] headers/deps: x86/cpu, arm64/cpu: Split out <asm/processor_api.h> from <asm/processor.h>
config: x86_64-randconfig-a011 (https://download.01.org/0day-ci/archive/20220420/202204202001.5zD2lyss-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=143f41d47c158e8acbbce44c87a78966d3e9f62f
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout 143f41d47c158e8acbbce44c87a78966d3e9f62f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/entry/vdso/ arch/x86/kernel/cpu/mtrr/ kernel/trace/

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

All warnings (new ones prefixed by >>):

>> arch/x86/entry/vdso/vdso32-setup.c:55:12: warning: no previous prototype for 'sysenter_setup' [-Wmissing-prototypes]
      55 | int __init sysenter_setup(void)
         |            ^~~~~~~~~~~~~~


vim +/sysenter_setup +55 arch/x86/entry/vdso/vdso32-setup.c

^1da177e4c3f4152 arch/i386/kernel/sysenter.c        Linus Torvalds      2005-04-16  54  
a6c4e076ee4c1ea6 arch/i386/kernel/sysenter.c        Jeremy Fitzhardinge 2007-05-02 @55  int __init sysenter_setup(void)
^1da177e4c3f4152 arch/i386/kernel/sysenter.c        Linus Torvalds      2005-04-16  56  {
0a6d1fa0d2b48fba arch/x86/entry/vdso/vdso32-setup.c Andy Lutomirski     2015-10-05  57  	init_vdso_image(&vdso_image_32);
^1da177e4c3f4152 arch/i386/kernel/sysenter.c        Linus Torvalds      2005-04-16  58  
^1da177e4c3f4152 arch/i386/kernel/sysenter.c        Linus Torvalds      2005-04-16  59  	return 0;
^1da177e4c3f4152 arch/i386/kernel/sysenter.c        Linus Torvalds      2005-04-16  60  }
e6e5494cb23d1933 arch/i386/kernel/sysenter.c        Ingo Molnar         2006-06-27  61  

:::::: The code at line 55 was first introduced by commit
:::::: a6c4e076ee4c1ea670e4faa55814e63dd08e3f29 [PATCH] i386: clean up identify_cpu

:::::: TO: Jeremy Fitzhardinge <jeremy@goop.org>
:::::: CC: Andi Kleen <andi@basil.nowhere.org>

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