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Re:Linux kernel exceeds 15 million lines of code by jlarocco on Friday January 13, 2012 @10:53AM (#3461031)
I don't know about the kernel specifically, but most large code bases are modular.

There's probably a small set of core kernel functionality that provide services for everybody, and then specialized interfaces for each of the driver types.

I would guess that few people are familiar with the entire structure. Most probably know the core interfaces and the design of the subsystem where they mostly work, like wireless drivers.

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