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SubjectRe: 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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