Re: Reg : module init and exit function

["Mohamed Thalib .H" <h.mohamedthalib@xxxxxxxxxxxxx>]

On Tue, 2008-11-04 at 11:14 +0530, Santosh wrote:
> Manish Katiyar wrote:
> > On Tue, Nov 4, 2008 at 9:48 AM, Santosh <ssantosh@xxxxxxxxxx> wrote:
> >> Mohamed Thalib .H wrote:
> >>> Hi all,
> >>>
> >>>        I have a doubt
> >>>
> >>>        Whether the code that is inside the moudles init and exit function
> >>> will
> >>> be executed if the module is not compiled as module and it is compiled
> >>> into the kernel image itself.
> >>>
> >>>
> >>        The module's init fucntion will be run even if it is compiled
> >> statically into the kernel image. The exit function won't be run since it
> >> can't be unloaded from the memory.
> >>
> >>        In case where the kernel is configured not to unload modules the exit
> >> function will never be run since the module never unloads. Once the init
> >> function is executed the function itself is discarded since it won't be
> >> needed later.
> > 
> > Correct........and that is the memory you see when you see your bootup
> > messages.  Something like
> > 
> > "Freed 128K of memory ....."
> > 
> > But I think for that you have to declare with __init or can it take
> > this decision by default ???
> 
> Yes, I guess to be freed up we use __init macro. Can it do this by 
> default, I am not sure.
> > 
> > Thanks -
> > Manish
> 
> 

>From the above i understand that once the __init code is complete then
it will be completely remove out of memory and it will be no longer
avaliable ..

am I correct.

and what about the __exit will it be included in the compile time or
not.

if included will it be removed at the time of executing free_initmem()
function. - i dont think so on seeing the code it looks like it frees
only the __init section. so the __exit section should be excluded in the
kernel compile time itself.

correct me if i am wrong.

-- 
Best Regards,
Mohamed Thalib .H


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