Where Linux Kernel Documentation Hides

To answer the question in the title, kernel documentation hides in:

• The kernel tarball (a half-dozen different places)
• Web pages
• Magazine articles
• Online books
• Blog entries
• Wikis
• Conference papers
• Audio and video recordings of talks
• Standards documents
• Man pages
• List archives
• Source control commit messages
• Lots more (See this talk's paper for details and URLs)