linux-kernel - Re: [PATCH 8/8] memcg: rename mem_cgroup_ino() to mem_cgroup

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Message-ID: <202512262045.CkWwCNp7-lkp@intel.com>
Date: Fri, 26 Dec 2025 20:31:38 +0800
From: kernel test robot <lkp@...el.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, SeongJae Park <sj@...nel.org>,
	Meta kernel team <kernel-team@...a.com>, cgroups@...r.kernel.org,
	damon@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] memcg: rename mem_cgroup_ino() to mem_cgroup_id()

Hi Shakeel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on sj/damon/next]
[cannot apply to akpm-mm/mm-everything tj-cgroup/for-next linus/master v6.19-rc2 next-20251219]
[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/Shakeel-Butt/memcg-introduce-private-id-API-for-in-kernel-users/20251226-072954
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sj/linux.git damon/next
patch link:    https://lore.kernel.org/r/20251225232116.294540-9-shakeel.butt%40linux.dev
patch subject: [PATCH 8/8] memcg: rename mem_cgroup_ino() to mem_cgroup_id()
config: arm64-randconfig-001-20251226 (https://download.01.org/0day-ci/archive/20251226/202512262045.CkWwCNp7-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251226/202512262045.CkWwCNp7-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/202512262045.CkWwCNp7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/damon/sysfs.c:2704:33: warning: format specifies type 'unsigned int' but the argument has type 'u64' (aka 'unsigned long long') [-Wformat]
    2704 |                 pr_info("id: %u, path: %s\n", mem_cgroup_id(memcg), path);
         |                              ~~               ^~~~~~~~~~~~~~~~~~~~
         |                              %llu
   include/linux/printk.h:585:34: note: expanded from macro 'pr_info'
     585 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |                                 ~~~     ^~~~~~~~~~~
   include/linux/printk.h:512:60: note: expanded from macro 'printk'
     512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
         |                                                     ~~~    ^~~~~~~~~~~
   include/linux/printk.h:484:19: note: expanded from macro 'printk_index_wrap'
     484 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ~~~~    ^~~~~~~~~~~
   1 warning generated.


vim +2704 mm/damon/sysfs.c

c951cd3b89010c SeongJae Park 2022-03-22  2690  
a25dadf8af8ddc SeongJae Park 2022-11-18  2691  static ssize_t debug_show(struct kobject *kobj,
a25dadf8af8ddc SeongJae Park 2022-11-18  2692  		struct kobj_attribute *attr, char *buf)
a25dadf8af8ddc SeongJae Park 2022-11-18  2693  {
a25dadf8af8ddc SeongJae Park 2022-11-18  2694  #ifdef CONFIG_MEMCG
a25dadf8af8ddc SeongJae Park 2022-11-18  2695  	struct mem_cgroup *memcg;
a25dadf8af8ddc SeongJae Park 2022-11-18  2696  	char *path = kmalloc(sizeof(*path) * PATH_MAX, GFP_KERNEL);
a25dadf8af8ddc SeongJae Park 2022-11-18  2697  
a25dadf8af8ddc SeongJae Park 2022-11-18  2698  	if (!path)
a25dadf8af8ddc SeongJae Park 2022-11-18  2699  		return -ENOMEM;
a25dadf8af8ddc SeongJae Park 2022-11-18  2700  
a25dadf8af8ddc SeongJae Park 2022-11-18  2701  	for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg; memcg =
a25dadf8af8ddc SeongJae Park 2022-11-18  2702  			mem_cgroup_iter(NULL, memcg, NULL)) {
a25dadf8af8ddc SeongJae Park 2022-11-18  2703  		cgroup_path(memcg->css.cgroup, path, PATH_MAX);
a25dadf8af8ddc SeongJae Park 2022-11-18 @2704  		pr_info("id: %u, path: %s\n", mem_cgroup_id(memcg), path);
a25dadf8af8ddc SeongJae Park 2022-11-18  2705  	}
a25dadf8af8ddc SeongJae Park 2022-11-18  2706  
a25dadf8af8ddc SeongJae Park 2022-11-18  2707  	kfree(path);
a25dadf8af8ddc SeongJae Park 2022-11-18  2708  #endif
a25dadf8af8ddc SeongJae Park 2022-11-18  2709  
a25dadf8af8ddc SeongJae Park 2022-11-18  2710  	return 0;
a25dadf8af8ddc SeongJae Park 2022-11-18  2711  }
a25dadf8af8ddc SeongJae Park 2022-11-18  2712  

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