linux-kernel - Re: [PATCH v2] fixup: mm/huge_memory.c: introduce folio_split

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Message-ID: <202511202251.PCvSd2p2-lkp@intel.com>
Date: Thu, 20 Nov 2025 23:07:24 +0800
From: kernel test robot <lkp@...el.com>
To: Balbir Singh <balbirs@...dia.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, dri-devel@...ts.freedesktop.org
Cc: oe-kbuild-all@...ts.linux.dev, Balbir Singh <balbirs@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
	Joshua Hahn <joshua.hahnjy@...il.com>, Rakie Kim <rakie.kim@...com>,
	Byungchul Park <byungchul@...com>,
	Gregory Price <gourry@...rry.net>,
	Ying Huang <ying.huang@...ux.alibaba.com>,
	Alistair Popple <apopple@...dia.com>,
	Oscar Salvador <osalvador@...e.de>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
	Lyude Paul <lyude@...hat.com>, Danilo Krummrich <dakr@...nel.org>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Ralph Campbell <rcampbell@...dia.com>,
	Mika Penttilä <mpenttil@...hat.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Francois Dugast <francois.dugast@...el.com>
Subject: Re: [PATCH v2] fixup: mm/huge_memory.c: introduce
 folio_split_unmapped

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@...el.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	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki