To make it easier for users to load and unload modules, to avoid wasting kernel memory by keeping drivers in core when they are not in use, and to allow the creation of "generic'' kernels that can support a wide variety of hardware, Linux offers support for automatic loading and unloading of modules. To exploit this feature, you need to enable kmod support when you configure the kernel before you compile it; most kernels from distributors come with kmod enabled. This ability to request additional modules when they are needed is particularly useful for drivers using module stacking.
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