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Date:	Tue, 19 Aug 2008 22:47:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: Re: [-mm] sysfs: duplicate filename 'acpi' can not be created

On Wed, 20 Aug 2008 13:34:42 +0800 Li Zefan <lizf@...fujitsu.com> wrote:

> 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.

The only acpi-specific patches in mm(otm) are

acpi-add-checking-for-null-early-param.patch
acpi-avoid-dropping-rapid-hotkey-events-or-other-gpes-on-asus-eeepc.patch
mm-only-enforce-acpi-resource-conflict-checks.patch

so I'd say you've hit a linux-next regression there.

Random-possible-feel-it-in-my-water-guess: do you have CONFIG_FASTBOOT
set and if so, does unsetting it fix things?
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