arch/x86/entry/vdso/vma.c:32:19: warning: no previous prototype for 'arch_get_vdso_data'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92477dd1faa650e50bd3bb35a6c0b8d09198cc35
commit: 64b302ab66c5965702693e79690823ca120288b9 x86/vdso: Provide vdso_data offset on vvar_page
date:   1 year, 8 months ago
config: i386-randconfig-r036-20210927 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=64b302ab66c5965702693e79690823ca120288b9
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 64b302ab66c5965702693e79690823ca120288b9
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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

All warnings (new ones prefixed by >>):

>> arch/x86/entry/vdso/vma.c:32:19: warning: no previous prototype for 'arch_get_vdso_data' [-Wmissing-prototypes]
      32 | struct vdso_data *arch_get_vdso_data(void *vvar_page)
         |                   ^~~~~~~~~~~~~~~~~~


vim +/arch_get_vdso_data +32 arch/x86/entry/vdso/vma.c

    31	
  > 32	struct vdso_data *arch_get_vdso_data(void *vvar_page)
    33	{
    34		return (struct vdso_data *)(vvar_page + _vdso_data_offset);
    35	}
    36	#undef EMIT_VVAR
    37	

---
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Attachment: .config.gz
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