Reboot not calling module_exit of LKM

[Ramesh.P]

Thanks Greg. Appreciate your reply.

Regards,
Ramesh

On Fri, Aug 5, 2011 at 12:06 PM, Greg KH <greg at kroah.com> wrote:
> On Fri, Aug 05, 2011 at 11:39:16AM -0700, Ramesh.P wrote:
>> Hi,
>>
>> Good day!
>>
>> When a system is rebooted, the loadable kernel modules 'module_exit'
>> functions are not called. I see this behavior in a custom kernel. My
>> questions are
>>
>> a. Is this applicable in mainline/normal kernel too?
>
> Yes.
>
>> b. If yes, what are the reasons? (One reason may be, not to get into
>> new problems while cleaning up the module)
>
> You don't need to unload a module as the machine is about to be turned
> off.
>
>> c. Is there anyway for the kernel module to know the system is getting
>> rebooted? (Apart from letting userspace to indicate the kernel
>> module).
>
> Yes, hook to the reboot notifier.
>
>