FYI, we noticed the below changes on

git://git.collabora.co.uk/git/user/tomeu/linux.git ordered-probing-v1
commit 563b1abc5f7a1b8e1279369d7644be36c2bb87b0 ("driver-core: defer all probes until late_initcall")


+---------------------------------------------+------------+------------+
|                                             | 77b0c6390e | 563b1abc5f |
+---------------------------------------------+------------+------------+
| boot_successes                              | 17         | 0          |
| boot_failures                               | 0          | 12         |
| WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup() | 0          | 12         |
| backtrace:deferred_probe_work_func          | 0          | 12         |
+---------------------------------------------+------------+------------+


[    5.321476] registered taskstats version 1
[    5.355397] Btrfs loaded
[    5.359914] ------------[ cut here ]------------
[    5.360833] WARNING: CPU: 0 PID: 6 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x65/0x75()
[    5.362564] sysfs: cannot create duplicate filename '/devices/system/cpu/cpu0/microcode'
[    5.364166] Modules linked in:
[    5.364961] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 4.1.0-rc5-next-20150529-00013-g2f3dd1dd #618
[    5.366686] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    5.368499] Workqueue: deferwq deferred_probe_work_func
[    5.369516]  0000000000000009 ffff8800124fbb98 ffffffff81c2dc11 ffffffff810e3f23
[    5.371318]  ffff8800124fbbe8 ffff8800124fbbd8 ffffffff8108c2a1 ffff88001262f000
[    5.373119]  ffffffff81233cc8 ffff88000d635668 ffffffff8207f0f7 ffff88001262f000
[    5.374917] Call Trace:
[    5.375598]  [<ffffffff81c2dc11>] dump_stack+0x4c/0x65
[    5.376547]  [<ffffffff810e3f23>] ? console_unlock+0x405/0x434
[    5.377559]  [<ffffffff8108c2a1>] warn_slowpath_common+0xa1/0xbb
[    5.378588]  [<ffffffff81233cc8>] ? sysfs_warn_dup+0x65/0x75
[    5.379581]  [<ffffffff8108c301>] warn_slowpath_fmt+0x46/0x48
[    5.380586]  [<ffffffff8123089c>] ? kernfs_path+0x4d/0x58
[    5.381551]  [<ffffffff81233cc8>] sysfs_warn_dup+0x65/0x75
[    5.382530]  [<ffffffff812342d4>] internal_create_group+0xc7/0x20c
[    5.383574]  [<ffffffff8123442c>] sysfs_create_group+0x13/0x15
[    5.384585]  [<ffffffff8106a01b>] mc_device_add+0x61/0x7e
[    5.385558]  [<ffffffff816d9f68>] bus_probe_device+0x86/0xa0
[    5.386553]  [<ffffffff816da51b>] deferred_probe_work_func+0x16d/0x188
[    5.387633]  [<ffffffff810a47b0>] process_one_work+0x289/0x561
[    5.388642]  [<ffffffff810a585c>] worker_thread+0x288/0x380
[    5.399138]  [<ffffffff810a55d4>] ? rescuer_thread+0x2d2/0x2d2
[    5.400156]  [<ffffffff810aa565>] kthread+0x116/0x11e
[    5.401096]  [<ffffffff810d34d1>] ? trace_hardirqs_on+0xd/0xf
[    5.402104]  [<ffffffff810aa44f>] ? kthread_create_on_node+0x1b6/0x1b6
[    5.403202]  [<ffffffff81c3cb9f>] ret_from_fork+0x3f/0x70
[    5.404177]  [<ffffffff810aa44f>] ? kthread_create_on_node+0x1b6/0x1b6
[    5.405261] ---[ end trace 405f055e28333b16 ]---
[    5.406692]   Magic number: 3:377:390



Thanks,
Ying Huang
-------------------------------------
lkp@eclists.intel.com
https://eclists.intel.com/sympa/info/lkp
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