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SubjectRe: [PATCH v2] dm: allow device-mapper to operate without dax support
Hi Dan,

[auto build test ERROR on dm/for-next]
[also build test ERROR on v4.13-rc3 next-20170802]
[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/Dan-Williams/dm-allow-device-mapper-to-operate-without-dax-support/20170802-155255
base: https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
config: s390-defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=s390

All errors (new ones prefixed by >>):

drivers/md/dm.o: In function `cleanup_mapped_device':
>> drivers/md/dm.c:1684: undefined reference to `kill_dax'
>> drivers/md/dm.c:1685: undefined reference to `put_dax'
drivers/md/dm.o: In function `close_table_device':
drivers/md/dm.c:651: undefined reference to `put_dax'
drivers/md/dm.o: In function `open_table_device':
>> drivers/md/dm.c:637: undefined reference to `dax_get_by_host'
drivers/md/dm.o: In function `dm_dax_flush':
>> drivers/md/dm.c:1003: undefined reference to `dax_get_private'
drivers/md/dm.o: In function `dm_dax_copy_from_iter':
drivers/md/dm.c:979: undefined reference to `dax_get_private'
drivers/md/dm.o: In function `dm_dax_direct_access':
drivers/md/dm.c:951: undefined reference to `dax_get_private'
drivers/md/dm.o: In function `alloc_dev':
>> drivers/md/dm.c:1783: undefined reference to `alloc_dax'
drivers/md/dm-table.o: In function `device_dax_write_cache_enabled':
drivers/md/dm-table.c:1644: undefined reference to `dax_write_cache_enabled'
drivers/md/dm-table.o: In function `dm_table_set_restrictions':
drivers/md/dm-table.c:1822: undefined reference to `dax_write_cache'
drivers/md/dm-linear.o: In function `linear_dax_flush':
>> drivers/md/dm-linear.c:197: undefined reference to `bdev_dax_pgoff'
>> drivers/md/dm-linear.c:199: undefined reference to `dax_flush'
drivers/md/dm-linear.o: In function `linear_dax_copy_from_iter':
drivers/md/dm-linear.c:183: undefined reference to `bdev_dax_pgoff'
>> drivers/md/dm-linear.c:185: undefined reference to `dax_copy_from_iter'
drivers/md/dm-linear.o: In function `linear_dax_direct_access':
drivers/md/dm-linear.c:168: undefined reference to `bdev_dax_pgoff'
>> drivers/md/dm-linear.c:171: undefined reference to `dax_direct_access'
drivers/md/dm-stripe.o: In function `stripe_dax_flush':
>> drivers/md/dm-stripe.c:369: undefined reference to `bdev_dax_pgoff'
>> drivers/md/dm-stripe.c:371: undefined reference to `dax_flush'
drivers/md/dm-stripe.o: In function `stripe_dax_copy_from_iter':
drivers/md/dm-stripe.c:350: undefined reference to `bdev_dax_pgoff'
>> drivers/md/dm-stripe.c:352: undefined reference to `dax_copy_from_iter'
drivers/md/dm-stripe.o: In function `stripe_dax_direct_access':
drivers/md/dm-stripe.c:330: undefined reference to `bdev_dax_pgoff'
>> drivers/md/dm-stripe.c:333: undefined reference to `dax_direct_access'

vim +1684 drivers/md/dm.c

4a0b4ddf2 Mike Snitzer 2010-08-12 1672
0f20972f7 Mike Snitzer 2015-04-28 1673 static void cleanup_mapped_device(struct mapped_device *md)
0f20972f7 Mike Snitzer 2015-04-28 1674 {
0f20972f7 Mike Snitzer 2015-04-28 1675 if (md->wq)
0f20972f7 Mike Snitzer 2015-04-28 1676 destroy_workqueue(md->wq);
0f20972f7 Mike Snitzer 2015-04-28 1677 if (md->kworker_task)
0f20972f7 Mike Snitzer 2015-04-28 1678 kthread_stop(md->kworker_task);
0f20972f7 Mike Snitzer 2015-04-28 1679 mempool_destroy(md->io_pool);
0f20972f7 Mike Snitzer 2015-04-28 1680 if (md->bs)
0f20972f7 Mike Snitzer 2015-04-28 1681 bioset_free(md->bs);
0f20972f7 Mike Snitzer 2015-04-28 1682
f26c5719b Dan Williams 2017-04-12 1683 if (md->dax_dev) {
f26c5719b Dan Williams 2017-04-12 @1684 kill_dax(md->dax_dev);
f26c5719b Dan Williams 2017-04-12 @1685 put_dax(md->dax_dev);
f26c5719b Dan Williams 2017-04-12 1686 md->dax_dev = NULL;
f26c5719b Dan Williams 2017-04-12 1687 }
f26c5719b Dan Williams 2017-04-12 1688
0f20972f7 Mike Snitzer 2015-04-28 1689 if (md->disk) {
0f20972f7 Mike Snitzer 2015-04-28 1690 spin_lock(&_minor_lock);
0f20972f7 Mike Snitzer 2015-04-28 1691 md->disk->private_data = NULL;
0f20972f7 Mike Snitzer 2015-04-28 1692 spin_unlock(&_minor_lock);
0f20972f7 Mike Snitzer 2015-04-28 1693 del_gendisk(md->disk);
0f20972f7 Mike Snitzer 2015-04-28 1694 put_disk(md->disk);
0f20972f7 Mike Snitzer 2015-04-28 1695 }
0f20972f7 Mike Snitzer 2015-04-28 1696
0f20972f7 Mike Snitzer 2015-04-28 1697 if (md->queue)
0f20972f7 Mike Snitzer 2015-04-28 1698 blk_cleanup_queue(md->queue);
0f20972f7 Mike Snitzer 2015-04-28 1699
d09960b00 Tahsin Erdogan 2016-10-10 1700 cleanup_srcu_struct(&md->io_barrier);
d09960b00 Tahsin Erdogan 2016-10-10 1701
0f20972f7 Mike Snitzer 2015-04-28 1702 if (md->bdev) {
0f20972f7 Mike Snitzer 2015-04-28 1703 bdput(md->bdev);
0f20972f7 Mike Snitzer 2015-04-28 1704 md->bdev = NULL;
0f20972f7 Mike Snitzer 2015-04-28 1705 }
4cc96131a Mike Snitzer 2016-05-12 1706
4cc96131a Mike Snitzer 2016-05-12 1707 dm_mq_cleanup_mapped_device(md);
0f20972f7 Mike Snitzer 2015-04-28 1708 }
0f20972f7 Mike Snitzer 2015-04-28 1709
^1da177e4 Linus Torvalds 2005-04-16 1710 /*
^1da177e4 Linus Torvalds 2005-04-16 1711 * Allocate and initialise a blank device with a given minor.
^1da177e4 Linus Torvalds 2005-04-16 1712 */
2b06cfff1 Alasdair G Kergon 2006-06-26 1713 static struct mapped_device *alloc_dev(int minor)
^1da177e4 Linus Torvalds 2005-04-16 1714 {
115485e83 Mike Snitzer 2016-02-22 1715 int r, numa_node_id = dm_get_numa_node();
74f22ed6b Dan Williams 2017-08-01 1716 struct dax_device *dax_dev = NULL;
115485e83 Mike Snitzer 2016-02-22 1717 struct mapped_device *md;
ba61fdd17 Jeff Mahoney 2006-06-26 1718 void *old_md;
^1da177e4 Linus Torvalds 2005-04-16 1719
115485e83 Mike Snitzer 2016-02-22 1720 md = kzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id);
^1da177e4 Linus Torvalds 2005-04-16 1721 if (!md) {
^1da177e4 Linus Torvalds 2005-04-16 1722 DMWARN("unable to allocate device, out of memory.");
^1da177e4 Linus Torvalds 2005-04-16 1723 return NULL;
^1da177e4 Linus Torvalds 2005-04-16 1724 }
^1da177e4 Linus Torvalds 2005-04-16 1725
10da4f795 Jeff Mahoney 2006-06-26 1726 if (!try_module_get(THIS_MODULE))
6ed7ade89 Milan Broz 2008-02-08 1727 goto bad_module_get;
10da4f795 Jeff Mahoney 2006-06-26 1728
^1da177e4 Linus Torvalds 2005-04-16 1729 /* get a minor number for the dev */
2b06cfff1 Alasdair G Kergon 2006-06-26 1730 if (minor == DM_ANY_MINOR)
cf13ab8e0 Frederik Deweerdt 2008-04-24 1731 r = next_free_minor(&minor);
2b06cfff1 Alasdair G Kergon 2006-06-26 1732 else
cf13ab8e0 Frederik Deweerdt 2008-04-24 1733 r = specific_minor(minor);
^1da177e4 Linus Torvalds 2005-04-16 1734 if (r < 0)
6ed7ade89 Milan Broz 2008-02-08 1735 goto bad_minor;
^1da177e4 Linus Torvalds 2005-04-16 1736
83d5e5b0a Mikulas Patocka 2013-07-10 1737 r = init_srcu_struct(&md->io_barrier);
83d5e5b0a Mikulas Patocka 2013-07-10 1738 if (r < 0)
83d5e5b0a Mikulas Patocka 2013-07-10 1739 goto bad_io_barrier;
83d5e5b0a Mikulas Patocka 2013-07-10 1740
115485e83 Mike Snitzer 2016-02-22 1741 md->numa_node_id = numa_node_id;
4cc96131a Mike Snitzer 2016-05-12 1742 md->use_blk_mq = dm_use_blk_mq_default();
591ddcfc4 Mike Snitzer 2016-01-31 1743 md->init_tio_pdu = false;
a5664dad7 Mike Snitzer 2010-08-12 1744 md->type = DM_TYPE_NONE;
e61290a4a Daniel Walker 2008-02-08 1745 mutex_init(&md->suspend_lock);
a5664dad7 Mike Snitzer 2010-08-12 1746 mutex_init(&md->type_lock);
86f1152b1 Benjamin Marzinski 2014-08-13 1747 mutex_init(&md->table_devices_lock);
022c26110 Mikulas Patocka 2009-04-02 1748 spin_lock_init(&md->deferred_lock);
^1da177e4 Linus Torvalds 2005-04-16 1749 atomic_set(&md->holders, 1);
5c6bd75d0 Alasdair G Kergon 2006-06-26 1750 atomic_set(&md->open_count, 0);
^1da177e4 Linus Torvalds 2005-04-16 1751 atomic_set(&md->event_nr, 0);
7a8c3d3b9 Mike Anderson 2007-10-19 1752 atomic_set(&md->uevent_seq, 0);
7a8c3d3b9 Mike Anderson 2007-10-19 1753 INIT_LIST_HEAD(&md->uevent_list);
86f1152b1 Benjamin Marzinski 2014-08-13 1754 INIT_LIST_HEAD(&md->table_devices);
7a8c3d3b9 Mike Anderson 2007-10-19 1755 spin_lock_init(&md->uevent_lock);
^1da177e4 Linus Torvalds 2005-04-16 1756
115485e83 Mike Snitzer 2016-02-22 1757 md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id);
^1da177e4 Linus Torvalds 2005-04-16 1758 if (!md->queue)
0f20972f7 Mike Snitzer 2015-04-28 1759 goto bad;
^1da177e4 Linus Torvalds 2005-04-16 1760
4a0b4ddf2 Mike Snitzer 2010-08-12 1761 dm_init_md_queue(md);
9faf400f7 Stefan Bader 2006-10-03 1762
115485e83 Mike Snitzer 2016-02-22 1763 md->disk = alloc_disk_node(1, numa_node_id);
^1da177e4 Linus Torvalds 2005-04-16 1764 if (!md->disk)
0f20972f7 Mike Snitzer 2015-04-28 1765 goto bad;
^1da177e4 Linus Torvalds 2005-04-16 1766
316d315bf Nikanth Karthikesan 2009-10-06 1767 atomic_set(&md->pending[0], 0);
316d315bf Nikanth Karthikesan 2009-10-06 1768 atomic_set(&md->pending[1], 0);
f0b041153 Jeff Mahoney 2006-06-26 1769 init_waitqueue_head(&md->wait);
53d5914f2 Mikulas Patocka 2009-04-02 1770 INIT_WORK(&md->work, dm_wq_work);
f0b041153 Jeff Mahoney 2006-06-26 1771 init_waitqueue_head(&md->eventq);
2995fa78e Mikulas Patocka 2014-01-13 1772 init_completion(&md->kobj_holder.completion);
2eb6e1e3a Keith Busch 2014-10-17 1773 md->kworker_task = NULL;
f0b041153 Jeff Mahoney 2006-06-26 1774
^1da177e4 Linus Torvalds 2005-04-16 1775 md->disk->major = _major;
^1da177e4 Linus Torvalds 2005-04-16 1776 md->disk->first_minor = minor;
^1da177e4 Linus Torvalds 2005-04-16 1777 md->disk->fops = &dm_blk_dops;
^1da177e4 Linus Torvalds 2005-04-16 1778 md->disk->queue = md->queue;
^1da177e4 Linus Torvalds 2005-04-16 1779 md->disk->private_data = md;
^1da177e4 Linus Torvalds 2005-04-16 1780 sprintf(md->disk->disk_name, "dm-%d", minor);
f26c5719b Dan Williams 2017-04-12 1781
74f22ed6b Dan Williams 2017-08-01 1782 if (IS_ENABLED(CONFIG_DAX)) {
f26c5719b Dan Williams 2017-04-12 @1783 dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops);
f26c5719b Dan Williams 2017-04-12 1784 if (!dax_dev)
f26c5719b Dan Williams 2017-04-12 1785 goto bad;
74f22ed6b Dan Williams 2017-08-01 1786 }
f26c5719b Dan Williams 2017-04-12 1787 md->dax_dev = dax_dev;
f26c5719b Dan Williams 2017-04-12 1788
^1da177e4 Linus Torvalds 2005-04-16 1789 add_disk(md->disk);
7e51f257e Mike Anderson 2006-03-27 1790 format_dev_t(md->name, MKDEV(_major, minor));
^1da177e4 Linus Torvalds 2005-04-16 1791
670368a8d Tejun Heo 2013-07-30 1792 md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
304f3f6a5 Milan Broz 2008-02-08 1793 if (!md->wq)
0f20972f7 Mike Snitzer 2015-04-28 1794 goto bad;
304f3f6a5 Milan Broz 2008-02-08 1795
32a926da5 Mikulas Patocka 2009-06-22 1796 md->bdev = bdget_disk(md->disk, 0);
32a926da5 Mikulas Patocka 2009-06-22 1797 if (!md->bdev)
0f20972f7 Mike Snitzer 2015-04-28 1798 goto bad;
32a926da5 Mikulas Patocka 2009-06-22 1799
3a83f4677 Ming Lei 2016-11-22 1800 bio_init(&md->flush_bio, NULL, 0);
6a8736d10 Tejun Heo 2010-09-08 1801 md->flush_bio.bi_bdev = md->bdev;
ff0361b34 Jan Kara 2017-05-31 1802 md->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC;
6a8736d10 Tejun Heo 2010-09-08 1803
fd2ed4d25 Mikulas Patocka 2013-08-16 1804 dm_stats_init(&md->stats);
fd2ed4d25 Mikulas Patocka 2013-08-16 1805
ba61fdd17 Jeff Mahoney 2006-06-26 1806 /* Populate the mapping, nobody knows we exist yet */
f32c10b09 Jeff Mahoney 2006-06-26 1807 spin_lock(&_minor_lock);
ba61fdd17 Jeff Mahoney 2006-06-26 1808 old_md = idr_replace(&_minor_idr, md, minor);
f32c10b09 Jeff Mahoney 2006-06-26 1809 spin_unlock(&_minor_lock);
ba61fdd17 Jeff Mahoney 2006-06-26 1810
ba61fdd17 Jeff Mahoney 2006-06-26 1811 BUG_ON(old_md != MINOR_ALLOCED);
ba61fdd17 Jeff Mahoney 2006-06-26 1812
^1da177e4 Linus Torvalds 2005-04-16 1813 return md;
^1da177e4 Linus Torvalds 2005-04-16 1814
0f20972f7 Mike Snitzer 2015-04-28 1815 bad:
0f20972f7 Mike Snitzer 2015-04-28 1816 cleanup_mapped_device(md);
83d5e5b0a Mikulas Patocka 2013-07-10 1817 bad_io_barrier:
^1da177e4 Linus Torvalds 2005-04-16 1818 free_minor(minor);
6ed7ade89 Milan Broz 2008-02-08 1819 bad_minor:
10da4f795 Jeff Mahoney 2006-06-26 1820 module_put(THIS_MODULE);
6ed7ade89 Milan Broz 2008-02-08 1821 bad_module_get:
^1da177e4 Linus Torvalds 2005-04-16 1822 kfree(md);
^1da177e4 Linus Torvalds 2005-04-16 1823 return NULL;
^1da177e4 Linus Torvalds 2005-04-16 1824 }
^1da177e4 Linus Torvalds 2005-04-16 1825

:::::: The code at line 1684 was first introduced by commit
:::::: f26c5719b2d7b00de69eb83eb1c1c831759fdc9b dm: add dax_device and dax_operations support

:::::: TO: Dan Williams <dan.j.williams@intel.com>
:::::: CC: Dan Williams <dan.j.williams@intel.com>

---
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