[arm-platforms:kvm-arm64/mmu/guest-MMIO-guard 20/23] mm/vmalloc.c:2536:13: warning: no previous prototype for function 'iounmap_page_range_hook'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/mmu/guest-MMIO-guard
head:   aadcd7eee6a1082ab94318bcb52fc494cbe0eb47
commit: df21882b06ba969aeede450a4c398a10d18b6aca [20/23] mm/ioremap: Add arch-specific callbacks on ioremap/iounmap calls
config: s390-randconfig-r014-20210630 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?id=df21882b06ba969aeede450a4c398a10d18b6aca
        git remote add arm-platforms https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
        git fetch --no-tags arm-platforms kvm-arm64/mmu/guest-MMIO-guard
        git checkout df21882b06ba969aeede450a4c398a10d18b6aca
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 

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

All warnings (new ones prefixed by >>):

   mm/vmalloc.c:1599:6: warning: no previous prototype for function 'set_iounmap_nonlazy' [-Wmissing-prototypes]
   void set_iounmap_nonlazy(void)
        ^
   mm/vmalloc.c:1599:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void set_iounmap_nonlazy(void)
   ^
   static 
>> mm/vmalloc.c:2536:13: warning: no previous prototype for function 'iounmap_page_range_hook' [-Wmissing-prototypes]
   void __weak iounmap_page_range_hook(phys_addr_t phys_addr, size_t size)
               ^
   mm/vmalloc.c:2536:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __weak iounmap_page_range_hook(phys_addr_t phys_addr, size_t size)
   ^
   static 
   mm/vmalloc.c:753:1: warning: unused function 'compute_subtree_max_size' [-Wunused-function]
   compute_subtree_max_size(struct vmap_area *va)
   ^
   3 warnings generated.


vim +/iounmap_page_range_hook +2536 mm/vmalloc.c

  2535	
> 2536	void __weak iounmap_page_range_hook(phys_addr_t phys_addr, size_t size)
  2537	{
  2538	}
  2539	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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