linux-kernel - Re: Create proc entry under /proc/sys/kernel

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Date:	Sun, 8 Jun 2008 21:59:21 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	RuoMu Hu <huruomu@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Create proc entry under /proc/sys/kernel

On Mon, Jun 09, 2008 at 01:44:57AM +0800, RuoMu Hu wrote:
> Alexey Dobriyan wrote:
>> On Sun, Jun 08, 2008 at 04:00:57PM +0800, RuoMu Hu wrote:
>>   
>>> Is it possible to create a proc entry under /proc/sys/kernel directly by 
>>> create_proc_read_entry in the way shown below?
>>>     
>>
>> No longer.
>>
>>   
>>> test_pde = create_proc_read_entry("/proc/sys/kernel/test", 0, NULL,
>>>                                    test_read_proc, NULL);
>>> if (test_pde == NULL) {
>>>    printk(KERN_ERR "Failed to create the test proc file.\n");
>>>    return -ENOMEM;
>>> }
>>>
>>> I'm using this in my kernel module but create_proc_read_entry always 
>>> returns fail, while there's no problem creating proc entries directly 
>>> under /proc.  The kernel source I'm building my kernel module against is 
>>> 2.6.25.4.
>>>     
>>
>> Use register_sysctl_table() for sysctls.
>>   
>
> Thank you for your hint, it really helped me.
>
> Another question: Is it possible to add an entry under /proc/sys/kernel by 
> register_sysctl_table() without modifying kernel source (adding an entry to 
> the kern_table[] array in kernel/sysctl.c)?

Yes.

grep for register_sysctl_table and you'll see how.

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