linux-kernel - Re: [PATCH v4 3/7] fs/dax: Use free_zone_device_folio

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Message-ID: <202601121151.afcnEvLk-lkp@intel.com>
Date: Mon, 12 Jan 2026 12:14:26 +0800
From: kernel test robot <lkp@...el.com>
To: Francois Dugast <francois.dugast@...el.com>,
	intel-xe@...ts.freedesktop.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	dri-devel@...ts.freedesktop.org,
	Matthew Brost <matthew.brost@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>, Zi Yan <ziy@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Balbir Singh <balbirs@...dia.com>, linux-fsdevel@...r.kernel.org,
	nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Francois Dugast <francois.dugast@...el.com>
Subject: Re: [PATCH v4 3/7] fs/dax: Use free_zone_device_folio_prepare()
 helper

Hi Francois,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on linus/master v6.19-rc4 next-20260109]
[cannot apply to drm-misc/drm-misc-next akpm-mm/mm-everything powerpc/topic/ppc-kvm pci/next pci/for-linus akpm-mm/mm-nonmm-unstable brauner-vfs/vfs.all daeinki-drm-exynos/exynos-drm-next drm/drm-next drm-i915/for-linux-next drm-i915/for-linux-next-fixes]
[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/Francois-Dugast/mm-zone_device-Add-order-argument-to-folio_free-callback/20260112-050347
base:   https://gitlab.freedesktop.org/drm/tip.git drm-tip
patch link:    https://lore.kernel.org/r/20260111205820.830410-4-francois.dugast%40intel.com
patch subject: [PATCH v4 3/7] fs/dax: Use free_zone_device_folio_prepare() helper
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260112/202601121151.afcnEvLk-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601121151.afcnEvLk-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/202601121151.afcnEvLk-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/dax.c:384:6: warning: unused variable 'order' [-Wunused-variable]
     384 |         int order, i;
         |             ^~~~~
>> fs/dax.c:384:13: warning: unused variable 'i' [-Wunused-variable]
     384 |         int order, i;
         |                    ^
   2 warnings generated.


vim +/order +384 fs/dax.c

38607c62b34b46 Alistair Popple 2025-02-28  380  
38607c62b34b46 Alistair Popple 2025-02-28  381  static inline unsigned long dax_folio_put(struct folio *folio)
6061b69b9a550a Shiyang Ruan    2022-06-03  382  {
38607c62b34b46 Alistair Popple 2025-02-28  383  	unsigned long ref;
38607c62b34b46 Alistair Popple 2025-02-28 @384  	int order, i;
38607c62b34b46 Alistair Popple 2025-02-28  385  
38607c62b34b46 Alistair Popple 2025-02-28  386  	if (!dax_folio_is_shared(folio))
38607c62b34b46 Alistair Popple 2025-02-28  387  		ref = 0;
38607c62b34b46 Alistair Popple 2025-02-28  388  	else
38607c62b34b46 Alistair Popple 2025-02-28  389  		ref = --folio->share;
38607c62b34b46 Alistair Popple 2025-02-28  390  
38607c62b34b46 Alistair Popple 2025-02-28  391  	if (ref)
38607c62b34b46 Alistair Popple 2025-02-28  392  		return ref;
38607c62b34b46 Alistair Popple 2025-02-28  393  
ae869c69ed0719 Matthew Brost   2026-01-11  394  	free_zone_device_folio_prepare(folio);
16900426586032 Shiyang Ruan    2022-12-01  395  
38607c62b34b46 Alistair Popple 2025-02-28  396  	return ref;
16900426586032 Shiyang Ruan    2022-12-01  397  }
16900426586032 Shiyang Ruan    2022-12-01  398  

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