Hi Qinxin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.17-rc1 next-20250814]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Qinxin-Xia/iommu-debug-Add-IOMMU-page-table-dump-debug-facility/20250814-173720
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250814093005.2040511-2-xiaqinxin%40huawei.com
patch subject: [PATCH 1/2] iommu/debug: Add IOMMU page table dump debug facility
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20250815/202508151456.FmgCiCK4-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250815/202508151456.FmgCiCK4-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202508151456.FmgCiCK4-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

quoted

mm/io_ptdump_debugfs.c:14:13: warning: no previous prototype for 'io_ptdump_debugfs_register' [-Wmissing-prototypes]

      14 | void __init io_ptdump_debugfs_register(const char *name)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/io_ptdump_debugfs_register +14 mm/io_ptdump_debugfs.c

    13	
  > 14	void __init io_ptdump_debugfs_register(const char *name)

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