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

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: i386-tinyconfig (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/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
        make W=1 ARCH=i386 

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

All warnings (new ones prefixed by >>):

   mm/vmalloc.c:1599:6: warning: no previous prototype for 'set_iounmap_nonlazy' [-Wmissing-prototypes]
    1599 | void set_iounmap_nonlazy(void)
         |      ^~~~~~~~~~~~~~~~~~~

quoted

mm/vmalloc.c:2536:13: warning: no previous prototype for 'iounmap_page_range_hook' [-Wmissing-prototypes]

    2536 | void __weak iounmap_page_range_hook(phys_addr_t phys_addr, size_t size)
         |             ^~~~~~~~~~~~~~~~~~~~~~~


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	

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