Re: [PATCH 2/4] btrfs: cache max and min order inside btrfs_fs_info

[kernel test robot <lkp@intel.com>]

Hi Qu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on kdave/for-next]
[also build test WARNING on next-20250901]
[cannot apply to linus/master v6.17-rc4]
[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/Qu-Wenruo/btrfs-support-all-block-sizes-which-is-no-larger-than-page-size/20250901-132648
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
patch link:    https://lore.kernel.org/r/d1a3793b551f0a6ccaf8907cc5aa06d8f5b3d5c2.1756703958.git.wqu%40suse.com
patch subject: [PATCH 2/4] btrfs: cache max and min order inside btrfs_fs_info
config: x86_64-buildonly-randconfig-004-20250902 (https://download.01.org/0day-ci/archive/20250902/202509021022.B3V4xUho-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250902/202509021022.B3V4xUho-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/202509021022.B3V4xUho-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/btrfs/extent_map.c:10:
   fs/btrfs/btrfs_inode.h: In function 'btrfs_set_inode_mapping_order':
>> fs/btrfs/btrfs_inode.h:530:31: warning: unused variable 'fs_info' [-Wunused-variable]
     530 |         struct btrfs_fs_info *fs_info = inode->root->fs_info;
         |                               ^~~~~~~
--
   In file included from fs/btrfs/tests/../transaction.h:15,
                    from fs/btrfs/tests/delayed-refs-tests.c:4:
   fs/btrfs/tests/../btrfs_inode.h: In function 'btrfs_set_inode_mapping_order':
>> fs/btrfs/tests/../btrfs_inode.h:530:31: warning: unused variable 'fs_info' [-Wunused-variable]
     530 |         struct btrfs_fs_info *fs_info = inode->root->fs_info;
         |                               ^~~~~~~


vim +/fs_info +530 fs/btrfs/btrfs_inode.h

   527	
   528	static inline void btrfs_set_inode_mapping_order(struct btrfs_inode *inode)
   529	{
 > 530		struct btrfs_fs_info *fs_info = inode->root->fs_info;
   531		/* Metadata inode should not reach here. */
   532		ASSERT(is_data_inode(inode));
   533	
   534		/* We only allow BITS_PER_LONGS blocks for each bitmap. */
   535	#ifdef CONFIG_BTRFS_EXPERIMENTAL
   536		mapping_set_folio_order_range(inode->vfs_inode.i_mapping, fs_info->block_min_order,
   537					      fs_info->block_max_order);
   538	#endif
   539	}
   540	

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