Re: [PATCH v2] fixup: mm/huge_memory.c: introduce folio_split_unmapped

kernel test robot
2025-11-20T15:08:38Z

Hi Balbir,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on next-20251120]
[cannot apply to drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.18-rc6]
[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/Balbir-Singh/fixup-mm-huge_memory-c-introduce-folio_split_unmapped/20251120-214322
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20251120134232.3588203-1-balbirs%40nvidia.com
patch subject: [PATCH v2] fixup: mm/huge_memory.c: introduce folio_split_unmapped
config: m68k-allnoconfig (https://download.01.org/0day-ci/archive/20251120/202511202251.PCvSd2p2-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251120/202511202251.PCvSd2p2-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511202251.PCvSd2p2-lkp@intel.com/

All warnings (new ones prefixed by >>):

In file included from mm/filemap.c:39:
>> include/linux/shmem_fs.h:160:13: warning: 'shmem_uncharge' defined but not used [-Wunused-function]
160 | static void shmem_uncharge(struct inode *inode, long pages)
| ^~~~~~~~~~~~~~
--
mm/shmem.c: In function '__shmem_file_setup':
mm/shmem.c:5838:23: warning: unused variable 'flags' [-Wunused-variable]
5838 | unsigned long flags = (vm_flags & VM_NORESERVE) ? SHMEM_F_NORESERVE : 0;
| ^~~~~
In file included from mm/shmem.c:36:
include/linux/shmem_fs.h: At top level:
>> include/linux/shmem_fs.h:160:13: warning: 'shmem_uncharge' defined but not used [-Wunused-function]
160 | static void shmem_uncharge(struct inode *inode, long pages)
| ^~~~~~~~~~~~~~

vim +/shmem_uncharge +160 include/linux/shmem_fs.h

159
> 160 static void shmem_uncharge(struct inode *inode, long pages)
161 {
162 }
163 #endif
164 extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
165 pgoff_t start, pgoff_t end);
166

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