linux-ext4 - Re: [PATCH] fs: Make wbc_to_tag() extern and use it in fs.

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Message-ID: <202509300954.4OaImb0r-lkp@intel.com>
Date: Tue, 30 Sep 2025 09:47:09 +0800
From: kernel test robot <lkp@...el.com>
To: Julian Sun <sunjunchao@...edance.com>, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
	ceph-devel@...r.kernel.org, linux-btrfs@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, clm@...com, dsterba@...e.com,
	xiubli@...hat.com, idryomov@...il.com, tytso@....edu,
	adilger.kernel@...ger.ca, jaegeuk@...nel.org, chao@...nel.org,
	willy@...radead.org, jack@...e.cz, brauner@...nel.org,
	agruenba@...hat.com
Subject: Re: [PATCH] fs: Make wbc_to_tag() extern and use it in fs.

Hi Julian,

kernel test robot noticed the following build errors:

[auto build test ERROR on kdave/for-next]
[also build test ERROR on ceph-client/testing ceph-client/for-linus tytso-ext4/dev jaegeuk-f2fs/dev-test jaegeuk-f2fs/dev gfs2/for-next akpm-mm/mm-everything linus/master v6.17 next-20250929]
[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/Julian-Sun/fs-Make-wbc_to_tag-extern-and-use-it-in-fs/20250929-175656
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
patch link:    https://lore.kernel.org/r/20250929095544.308392-1-sunjunchao%40bytedance.com
patch subject: [PATCH] fs: Make wbc_to_tag() extern and use it in fs.
config: s390-randconfig-001-20250930 (https://download.01.org/0day-ci/archive/20250930/202509300954.4OaImb0r-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250930/202509300954.4OaImb0r-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/202509300954.4OaImb0r-lkp@intel.com/

All errors (new ones prefixed by >>, old ones prefixed by <<):

WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/base/regmap/regmap-mmio.o
>> ERROR: modpost: "wbc_to_tag" [fs/btrfs/btrfs.ko] undefined!

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