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Loading Kernel Modules

Kernel modules are pieces of code that can be loaded and unloaded into the kernel upon demand. They extend the functionality of the kernel without the need to reboot the system.
A module can be configured as
  1. built-in or
  2. loadable.
To dynamically load or remove a module, it has to be configured as a loadable module in the kernel configuration (the line related to the module will therefore display the letter M). Modules are stored in
/usr/lib/modules/kernel_release. 
You can use the command uname -r to get your current kernel release version.

Linux Kernel by itself
Linux Kernel by itself

A module loaded into the kernel
A module loaded into the kernel

A kernel with many modules
A kernel with many modules