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Date:	Wed, 20 Aug 2008 13:34:42 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: [-mm] sysfs: duplicate filename 'acpi' can not be created

When I compiled latest -mm and booted up:

------------[ cut here ]------------
WARNING: at fs/sysfs/dir.c:463 sysfs_add_one+0x27/0x2f()
sysfs: duplicate filename 'acpi' can not be created
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.27-rc3-mm1 #2
 [<c0421173>] warn_slowpath+0x61/0x83
 [<c043b422>] __lock_acquire+0x601/0x658
 [<c047ea0d>] ifind+0x13/0x79
 [<c05c2ce9>] _spin_unlock+0x14/0x1c
 [<c047ea6d>] ifind+0x73/0x79
 [<c04a5a32>] sysfs_find_dirent+0x13/0x23
 [<c04a5ac5>] sysfs_add_one+0x27/0x2f
 [<c04a5f83>] create_dir+0x3c/0x81
 [<c04a5ff1>] sysfs_create_dir+0x29/0x3b
 [<c05c2ce9>] _spin_unlock+0x14/0x1c
 [<c04c466d>] kobject_add_internal+0xb1/0x14a
 [<c04c490b>] kobject_init_and_add+0x29/0x2c
 [<c06ea613>] kernel_param_sysfs_setup+0x4f/0x9f
 [<c06ea753>] param_sysfs_init+0xf0/0x147
 [<c0401122>] _stext+0x3a/0x12f
 [<c06ea663>] param_sysfs_init+0x0/0x147
 [<c041b3ee>] try_to_wake_up+0x146/0x14f
 [<c042d9f5>] __create_workqueue_key+0xa0/0x13c
 [<c06d9550>] kernel_init+0x18d/0x1f1
 [<c06d93c3>] kernel_init+0x0/0x1f1
 [<c04044ff>] kernel_thread_helper+0x7/0x10
 =======================
---[ end trace 4eaa2a86a8e2da22 ]---
kobject_add_internal failed for acpi with -EEXIST, don't try to register things with the same name in the same directory.
Pid: 1, comm: swapper Tainted: G        W 2.6.27-rc3-mm1 #2
 [<c04c46d0>] kobject_add_internal+0x114/0x14a
 [<c04c490b>] kobject_init_and_add+0x29/0x2c
 [<c06ea613>] kernel_param_sysfs_setup+0x4f/0x9f
 [<c06ea753>] param_sysfs_init+0xf0/0x147
 [<c0401122>] _stext+0x3a/0x12f
 [<c06ea663>] param_sysfs_init+0x0/0x147
 [<c041b3ee>] try_to_wake_up+0x146/0x14f
 [<c042d9f5>] __create_workqueue_key+0xa0/0x13c
 [<c06d9550>] kernel_init+0x18d/0x1f1
 [<c06d93c3>] kernel_init+0x0/0x1f1
 [<c04044ff>] kernel_thread_helper+0x7/0x10
 =======================
Module 'acpi' failed to be added to sysfs, error number -17
The system will be unstable now.
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