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

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Message-ID: <484C1A99.7070109@gmail.com>
Date:	Mon, 09 Jun 2008 01:44:57 +0800
From:	RuoMu Hu <huruomu@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Create proc entry under /proc/sys/kernel

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)?

Best regards,
Romu
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