Re: [PATCH 1/3] md: restore bitmap/location to fix wrong bitmap offset while growing

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

Hi Su,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v7.0-rc2 next-20260305]
[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/Su-Yue/md-restore-bitmap-location-to-fix-wrong-bitmap-offset-while-growing/20260303-114108
base:   linus/master
patch link:    https://lore.kernel.org/r/20260303033731.83885-2-glass.su%40suse.com
patch subject: [PATCH 1/3] md: restore bitmap/location to fix wrong bitmap offset while growing
config: i386-randconfig-051-20260305 (https://download.01.org/0day-ci/archive/20260306/202603060614.AZY6J9w9-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260306/202603060614.AZY6J9w9-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/202603060614.AZY6J9w9-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/md/md.o: in function `md_alloc':
>> drivers/md/md.c:6376:(.text+0xb36c): undefined reference to `md_sysfs_create_common_group'


vim +6376 drivers/md/md.c

  6276	
  6277	struct mddev *md_alloc(dev_t dev, char *name)
  6278	{
  6279		/*
  6280		 * If dev is zero, name is the name of a device to allocate with
  6281		 * an arbitrary minor number.  It will be "md_???"
  6282		 * If dev is non-zero it must be a device number with a MAJOR of
  6283		 * MD_MAJOR or mdp_major.  In this case, if "name" is NULL, then
  6284		 * the device is being created by opening a node in /dev.
  6285		 * If "name" is not NULL, the device is being created by
  6286		 * writing to /sys/module/md_mod/parameters/new_array.
  6287		 */
  6288		static DEFINE_MUTEX(disks_mutex);
  6289		struct mddev *mddev;
  6290		struct gendisk *disk;
  6291		int partitioned;
  6292		int shift;
  6293		int unit;
  6294		int error;
  6295	
  6296		/*
  6297		 * Wait for any previous instance of this device to be completely
  6298		 * removed (mddev_delayed_delete).
  6299		 */
  6300		flush_workqueue(md_misc_wq);
  6301	
  6302		mutex_lock(&disks_mutex);
  6303		mddev = mddev_alloc(dev);
  6304		if (IS_ERR(mddev)) {
  6305			error = PTR_ERR(mddev);
  6306			goto out_unlock;
  6307		}
  6308	
  6309		partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
  6310		shift = partitioned ? MdpMinorShift : 0;
  6311		unit = MINOR(mddev->unit) >> shift;
  6312	
  6313		if (name && !dev) {
  6314			/* Need to ensure that 'name' is not a duplicate.
  6315			 */
  6316			struct mddev *mddev2;
  6317			spin_lock(&all_mddevs_lock);
  6318	
  6319			list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
  6320				if (mddev2->gendisk &&
  6321				    strcmp(mddev2->gendisk->disk_name, name) == 0) {
  6322					spin_unlock(&all_mddevs_lock);
  6323					error = -EEXIST;
  6324					goto out_free_mddev;
  6325				}
  6326			spin_unlock(&all_mddevs_lock);
  6327		}
  6328		if (name && dev)
  6329			/*
  6330			 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
  6331			 */
  6332			mddev->hold_active = UNTIL_STOP;
  6333	
  6334		disk = blk_alloc_disk(NULL, NUMA_NO_NODE);
  6335		if (IS_ERR(disk)) {
  6336			error = PTR_ERR(disk);
  6337			goto out_free_mddev;
  6338		}
  6339	
  6340		disk->major = MAJOR(mddev->unit);
  6341		disk->first_minor = unit << shift;
  6342		disk->minors = 1 << shift;
  6343		if (name)
  6344			strcpy(disk->disk_name, name);
  6345		else if (partitioned)
  6346			sprintf(disk->disk_name, "md_d%d", unit);
  6347		else
  6348			sprintf(disk->disk_name, "md%d", unit);
  6349		disk->fops = &md_fops;
  6350		disk->private_data = mddev;
  6351	
  6352		disk->events |= DISK_EVENT_MEDIA_CHANGE;
  6353		mddev->gendisk = disk;
  6354		error = add_disk(disk);
  6355		if (error)
  6356			goto out_put_disk;
  6357	
  6358		kobject_init(&mddev->kobj, &md_ktype);
  6359		error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
  6360		if (error) {
  6361			/*
  6362			 * The disk is already live at this point.  Clear the hold flag
  6363			 * and let mddev_put take care of the deletion, as it isn't any
  6364			 * different from a normal close on last release now.
  6365			 */
  6366			mddev->hold_active = 0;
  6367			mutex_unlock(&disks_mutex);
  6368			mddev_put(mddev);
  6369			return ERR_PTR(error);
  6370		}
  6371	
  6372		/*
  6373		 * md_sysfs_remove_common_group is not needed because mddev_delayed_delete
  6374		 * calls kobject_put(&mddev->kobj) if mddev is to be deleted.
  6375		 */
> 6376		if (md_sysfs_create_common_group(mddev))
  6377			pr_warn("md: cannot register common bitmap attributes for %s\n",
  6378				mdname(mddev));
  6379	
  6380		kobject_uevent(&mddev->kobj, KOBJ_ADD);
  6381		mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
  6382		mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
  6383		mutex_unlock(&disks_mutex);
  6384		return mddev;
  6385	
  6386	out_put_disk:
  6387		put_disk(disk);
  6388	out_free_mddev:
  6389		mddev_free(mddev);
  6390	out_unlock:
  6391		mutex_unlock(&disks_mutex);
  6392		return ERR_PTR(error);
  6393	}
  6394	

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