Re: [PATCH RFC] fs: drop_caches: introduce per-node drop_caches interface

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

Hi Kefeng,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on brauner-vfs/vfs.all driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus linus/master v7.0-rc7 next-20260410]
[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/Kefeng-Wang/fs-drop_caches-introduce-per-node-drop_caches-interface/20260412-192452
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260409063503.3475420-1-wangkefeng.wang%40huawei.com
patch subject: [PATCH RFC] fs: drop_caches: introduce per-node drop_caches interface
config: powerpc64-randconfig-002-20260413 (https://download.01.org/0day-ci/archive/20260413/202604130943.MLP9ZgAQ-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260413/202604130943.MLP9ZgAQ-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/202604130943.MLP9ZgAQ-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/drop_caches.c:148:5: error: redefinition of 'drop_caches_register_node'
     148 | int drop_caches_register_node(struct node *node)
         |     ^
   include/linux/fs.h:3661:19: note: previous definition is here
    3661 | static inline int drop_caches_register_node(struct node *node) { return 0; }
         |                   ^
>> fs/drop_caches.c:153:6: error: redefinition of 'drop_caches_unregister_node'
     153 | void drop_caches_unregister_node(struct node *node)
         |      ^
   include/linux/fs.h:3662:20: note: previous definition is here
    3662 | static inline void drop_caches_unregister_node(struct node *node) {}
         |                    ^
   2 errors generated.


vim +/drop_caches_register_node +148 fs/drop_caches.c

   146	
   147	static DEVICE_ATTR_WO(drop_caches);
 > 148	int drop_caches_register_node(struct node *node)
   149	{
   150		return device_create_file(&node->dev, &dev_attr_drop_caches);
   151	}
   152	
 > 153	void drop_caches_unregister_node(struct node *node)

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