linux-kernel - Re: kobject: Fix kobject_rename and !CONFIG

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Date:	Tue, 13 May 2008 21:33:30 +0200
From:	"Benjamin Thery " <Benjamin.Thery@...l.net>
To:	Greg KH <greg@...ah.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Tejun Heo <htejun@...il.com>,
	Al Viro <viro@....linux.org.uk>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>, netdev@...r.kernel.org
Subject: Re: kobject: Fix kobject_rename and !CONFIG_SYSFS

Quoting Greg KH <greg@...ah.com>:

> On Tue, May 13, 2008 at 04:25:01PM +0200, Benjamin Thery wrote:
>> Eric W. Biederman wrote:
>>> Greg KH <greg@...ah.com> writes:
>>>> Eric, Randy Dunlap has found that this patch breaks the build when
>>>> CONFIG_SYSFS is not enabled.  Can you please fix it up before I send it
>>>> to Linus?
>>>>
>>>> The exact error is:
>>>> In file included from
>>>> /local/linsrc/next-20080509/include/linux/kobject.h:21,
>>>>                  from
>>>> /local/linsrc/next-20080509/include/linux/module.h:16,
>>>>                  from
>>>> /local/linsrc/next-20080509/include/linux/crypto.h:21,
>>>>                  from
>>>> /local/linsrc/next-20080509/arch/x86/kernel/asm-offsets_64.c:7,
>>>>                  from
>>>> /local/linsrc/next-20080509/arch/x86/kernel/asm-offsets.c:4:
>>>> /local/linsrc/next-20080509/include/linux/sysfs.h: In function
>>>> 'sysfs_rename_dir':
>>>> /local/linsrc/next-20080509/include/linux/sysfs.h:142: error: implicit
>>>> declaration of function 'kobject_set_name'
>>> I will take a look in the morning and see if I can see what is wrong.
>>> Which tree was this error against?  I thought I tested this case,
>>> and I'm wondering if there might be another patch that is hiding
>>> kobject_set_name.
>>
>> Argh, headers "cross-dependencies":
>>
>> * linux/kobject.h includes linux/sysfs.h before defining
>>   kobject_set_name()
>>
>> * linux/sysfs.h needs to include linux/kobject.h to find
>>   kobject_set_name() definition (for inlined sysfs_rename_dir() when
>>   CONFIG_SYSFS=n)
>>
>>
>> sysfs_rename_dir() is only called by kobject.c, kobject_rename().
>> I guess this kind of patch is not acceptable to fix the depency?
>
> Ick, no.  I'd rather add a kobject_set_name() function prototype to
> sysfs.h in this case, that should remove the error, right?

That's what I did first. But I thought it was worse than the above
solution.
Anyway, adding kobject_set_name() to sysfs.h did fix the error.

-Benjamin

>
> thanks,
>
> greg k-h
>
>



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