how can I know whether a module is a loadable module or compiled-in module?
 

Hi Gurus,
Could anyone tell how can I know whether a module is a loadable module or compiled-in module? As seems lsmod will list all modules of both loadable & compiled-in.

Thanks.

Where did you get that idea ?. lsmod lists the currently loaded modules. Potentially loadable modules are in /lib/modules/$(uname -r)

The definitive list is the kernel config used to create the kernel.

Thanks! Then could you suggest the way to get modules compiled into kernel? Maybe only check the configuration files when compiling the kernel(make config/make menuconfig etc)?

Checking .config doesn't give you modules list, you can get "options", not modules names.
For example: "NVidia NForce ethernet controller driver" option gives you "forcedeth" module.

You can get built-in modules list by running