B41 The modprobe Program
To automatically link a module, the kernel creates a kernel thread to execute the modprobe external program, 12! which takes care of possible complications due to module dependencies. The dependencies were discussed earlier: a module may require one or more other modules, and these in turn may require still other modules. For instance, the MS-DOS module requires another module named fat containing some code common to all filesystems based on a File Allocation Table (FAT). Thus, if it is not already present, the fat module must also be automatically linked into the running kernel when the MS-DOS module is requested. Resolving dependencies and finding modules is a type of activity that's best done in User Mode because it requires locating and accessing module object files in the filesystem.
Continue reading here: [2 This is one of the few examples in which the kernel relies on an external program
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