On Fri, Jun 15, 2007 at 04:55:47PM +0200, Devvrat Tripathi wrote:
> On 6/15/07, Adrian Bunk <bunk@xxxxxxxxx> wrote:
>>
>> On Fri, Jun 15, 2007 at 03:50:48PM +0200, Devvrat Tripathi wrote:
>> > can we declare an extern function(or say variable) inside the kernel and
>> > then later define it using a kernel module.
>>
>> No, it would be an unresolved symbol at link time.
>
>
> What exactly is the problem you are trying to solve?
>
>
> I want the data available to some functions inside the kernel to be
> available to my modules also. I thought i will generally call some extern
> funct from inside and then define it later from my modules which doesnt
> work. Now i am trying to do it through fucntion pointers which are exported
> so that i can change it in my module. still dont have the exact idea to
> accomplish the task .
If your module should be able to access data inside the kernel available
to modules simply EXPORT_SYMBOL the variables you use to access this
data.
Otherwise function pointers are a possible solution.
Or the simple solution:
Don't put the function into a module, compile it into the kernel.
> regards
>
> devvrat
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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