linux-kernel - Re: [PATCH v2 4/4] lockdep: Assign a lock_class per gendisk used for wait_for

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Date:   Sun, 22 Oct 2017 03:17:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Byungchul Park <byungchul.park@....com>
Cc:     kbuild-all@...org, peterz@...radead.org, mingo@...nel.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, tj@...nel.org, johannes.berg@...el.com,
        oleg@...hat.com, amir73il@...il.com, david@...morbit.com,
        darrick.wong@...cle.com, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        hch@...radead.org, idryomov@...il.com, kernel-team@....com
Subject: Re: [PATCH v2 4/4] lockdep: Assign a lock_class per gendisk used for
 wait_for_completion()

Hi Byungchul,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.14-rc5 next-20171018]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Byungchul-Park/Fix-false-positives-by-cross-release-feature/20171022-022121
config: i386-randconfig-x002-201743 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   block/genhd.c: In function '__alloc_disk_node':
>> block/genhd.c:1407:24: error: 'struct gendisk' has no member named 'lockdep_map'
     lockdep_init_map(&disk->lockdep_map, lock_name, key, 0);
                           ^~

vim +1407 block/genhd.c

  1356	
  1357	struct gendisk *__alloc_disk_node(int minors, int node_id, struct lock_class_key *key, const char *lock_name)
  1358	{
  1359		struct gendisk *disk;
  1360		struct disk_part_tbl *ptbl;
  1361	
  1362		if (minors > DISK_MAX_PARTS) {
  1363			printk(KERN_ERR
  1364				"block: can't allocated more than %d partitions\n",
  1365				DISK_MAX_PARTS);
  1366			minors = DISK_MAX_PARTS;
  1367		}
  1368	
  1369		disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
  1370		if (disk) {
  1371			if (!init_part_stats(&disk->part0)) {
  1372				kfree(disk);
  1373				return NULL;
  1374			}
  1375			disk->node_id = node_id;
  1376			if (disk_expand_part_tbl(disk, 0)) {
  1377				free_part_stats(&disk->part0);
  1378				kfree(disk);
  1379				return NULL;
  1380			}
  1381			ptbl = rcu_dereference_protected(disk->part_tbl, 1);
  1382			rcu_assign_pointer(ptbl->part[0], &disk->part0);
  1383	
  1384			/*
  1385			 * set_capacity() and get_capacity() currently don't use
  1386			 * seqcounter to read/update the part0->nr_sects. Still init
  1387			 * the counter as we can read the sectors in IO submission
  1388			 * patch using seqence counters.
  1389			 *
  1390			 * TODO: Ideally set_capacity() and get_capacity() should be
  1391			 * converted to make use of bd_mutex and sequence counters.
  1392			 */
  1393			seqcount_init(&disk->part0.nr_sects_seq);
  1394			if (hd_ref_init(&disk->part0)) {
  1395				hd_free_part(&disk->part0);
  1396				kfree(disk);
  1397				return NULL;
  1398			}
  1399	
  1400			disk->minors = minors;
  1401			rand_initialize_disk(disk);
  1402			disk_to_dev(disk)->class = &block_class;
  1403			disk_to_dev(disk)->type = &disk_type;
  1404			device_initialize(disk_to_dev(disk));
  1405		}
  1406	
> 1407		lockdep_init_map(&disk->lockdep_map, lock_name, key, 0);
  1408	
  1409		return disk;
  1410	}
  1411	EXPORT_SYMBOL(__alloc_disk_node);
  1412	

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