Using kernel modules lends a great amount of flexibility to the kernel. Kernel modules are essentially files containing relocatable object code linked into the kernel at runtime, much as a program uses a shared object. During development of the kernel, if it becomes apparent that some modules are subject to changes after the product is shipped, these should be put on the root file system as modules.
How does a module make itself apparent? Here are some factors to weigh when deciding if you should create a kernel module:
If you can afford the time and space necessary to load kernel modules during the boot process, then use kernel modules, because they make updating the kernel a much easier process.
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