Loadable Kernel Modules
Today's Linux kernel (post 2.7.27?) is a modular (not monolithic) kernel which comprises a base image and then modules which can be added to customize functionality. LKM can be added during the initial stages immediately after the base image is created/loaded or thereafter. Some LKM can be manually loaded on the fly by the User.
Display installed modules only
Look for a specific module
Method 1 - List all modules and grep for the specific module
ls -R /lib/modules/`uname -r`/kernel/ | grep module_name
Method 2 - Modprobe and tab Start with the following command but type the module name only until one or more characters is left, then [TAB] to autocomplete. If the autocomplete completes the module name, then it exists