Re: Exporting kernel symbols

[Pooja Gupta <pooja_pict@yahoo.com>]

Hi Ravi,
   Just try out using EXPORT_SYMBOL_NOVERS(..) instead
of EXPORT_SYMBOL(..).  
 
   I am not sure if it will help you. This worked out
for my code. I didn't do any change in the Makefile or
anything except the above line. :) Just check out if
it works. 
   Hope this helps.
   Pooja.

 --- Ravi <kravi26@yahoo.com> wrote: > Hello,
> 
>  While working with the 2.4.10 kernel, I wanted to
> export a function
> that I added. I found that EXPORT_SYMBOL(..) alone
> does not help if
> CONFIG_MODVERSIONS is set. I also didn't  find any
> document that
> explains how to make a kernel symbol available to
> modules. Below is the
> list of steps that I followed  - after some trial
> and error. Can
> someone please verify this?
> 
> 
> 
> HOWTO export a kernel symbol to modules
> ---------------------------------------
> Steps to make a symbol 'my_function' (defined in
> my_obj.c) available to
> kernel modules:
>  
> 1. Include the following two files in the source
> file (my_obj.c) :
> 
>  linux/module.h  and  linux/modsetver.h
>  
> 2. Add the following line to the source file:
>  
> EXPORT_SYMBOL(my_function);
>  
>  
> 3. Add the object filename to the 'export-objs'
> variable in the current
> directory's Makefile. If the variable does not
> exist, add it:
>  
> export_objs := my_obj.o
>  
>   3a. If the changes you are making are
> enabled/disabled by a config
> option, you can conditionally modify export-objs : 
> 
> #ifdef CONFIG_MY_OPTION
> export-objs += my_obj.o
> #endif
>  
>  
> IMPORTANT:
> Make sure that your file name does not clash with
> any of the existing
> files in include/linux/modules. For example, if a
> file 'my_obj.ver'
> already exists in include/linux/modules, you have to
> rename your file
> (or move only the EXPORT_SYMBOL and related parts to
> a different file).
> 
> ---------------------------
> 
> 
> -Thanks,
>  Ravi.
> 
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