Check if specific functionally is built into the kernel

On Sun, Feb 26, 2012 at 7:08 PM, Arokux B. [off-list ref] wrote:

Dear all,

I have the following problem. Some functionality can be either built
into the kernel or it can be build as a module. In the latter case the
application should load the module.

Is there a general approach to test if specific functionality is built
statically or as a module?

If available, you can check .config file.
(e.g check if CONFIG_X_OPTION=Y or CONFIG_X_OPTION=m).

thanks,
Daniel.