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When I uncompress the Linux kernel source code from Kernel.org, there are many folders. I know what most of them contain and their purpose. However, I cannot figure out or find on the Internet the purpose for the tools, samples, and block directories. What are these three directories and what is their purpose?

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I have figured out that the block folder contains source code for block-device drivers, samples is example programming, and tools contains tools for interacting with the kernel.

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The samples folder also contains modules that were started, but no maintainer has taken over. New kernel developers can look through here for a module that they would like to develop for the Linux Kernel team. –  Devyn Collier Johnson Jun 9 '13 at 12:17
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