Tools to help edit / navigate / hack the Kernel source:
= Downloading =
 * If you want to download the lastest kernel source, you need git. You can get it from [http://git.or.cz/index.html here].
 * There is a very good tutorial for kernel hackers on git [http://linux.yyz.us/git-howto.html here]

= Navigation Aid =

 * [http://lxr.linux.no/ Cross-Referencing Linux] : Nice website to browse the kernel source, search for identifiers, and diff between kernel versions. Uses [http://sourceforge.net/projects/lxr/ lxr] as its backend.
 * [http://www.kernelhq.org/ KernelHQ] : Another website to browse/navigate the kernel source. Has all the kernel sources since 1.0.

= Navigation Utilities =

 * [http://ctags.sourceforge.net/ ctags]
 * [http://cscope.sourceforge.net/ cscope]. Tutorials: [http://cscope.sourceforge.net/large_projects.html Using with large projects], [http://cscope.sourceforge.net/cscope_vim_tutorial.html Using Cscope with Vim].

= Version Control =

Navigate the changesets applied to:
 * [http://kernel.org/git/?p=linux/kernel/git/marcelo/linux-2.4.git;a=summary linux-2.4]
 * [http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=summary linux-2.6]