Android Mainlining Project

This page is for organizing the Android Mainlining Project. It has information and resources associated with this project.

Goal
The goal of this project is to ultimately mainline all patches required to run the current released version of Android. The purpose of mainlining these patches it 3-fold:
 * 1) to allow a developer to use the latest released version of the Linux kernel to run an Android system, without requiring patches to their kernel
 * 2) to make it possible to develop drivers and board support features against either an Android kernel release or a kernel.org kernel release, with little or no modifications or conditional code
 * 3) to reduce or eliminate the burden of maintaining independent patches from release to release for Android kernel developers

To "mainline" a patch means to have it included in Linus Torvalds kernel.org kernel, in a released (non-rc) version.

Process
[This is a draft section, up for discussion]

Overall:
 * identify all patches/features, and categorize into core or non/core
 * core = feature is required or strongly desired for Android operation on a platform
 * non-core = Most of the Android system can run without the feature

Per feature or patch:
 * research any previous submission feedback
 * incorporate feedback, as appropriate
 * negotiate any interface changes with Google Android team
 * submit updated patches to mainline
 * repeat until accepted

Resources

 * Mailing list for discussions is at: https://lists.linuxfoundation.org/mailman/listinfo/ce-android-mainline
 * Linaro blueprint for project: https://blueprints.launchpad.net/linux-linaro/+spec/linaro-kernel-android-upstreaming

People
People who have expressed interest in this:


 * Tim Bird
 * John Stultz
 * Paul McKenney
 * Deepak Saxena
 * Arnd Bergmann
 * Thomas Gleixner
 * Arjan Van de Ven
 * Brian Swetland
 * Tetsuyuki Kobayashi
 * Andy Green
 * Victor M. Jaquez
 * Jesse Barker
 * Anton Vorontsov
 * Greg Kroah-Hartman

roles/expertise
This section has miscellaneous notes on roles, capabilities and expertise of group's members

John Stultz is the owner of the Linaro blueprint for mainlining Android features. Tim Bird is the owner of the CE Workgroup project for mainlining Android features. Deepak and Jesse can help make arrangements for a meeting at Linaro Connect. Tim can help make arrangements for a meeting at Android Builders Summit.


 * John Stultz has worked on POSIX Alarm timers
 * Jesse is working on shared memory buffers related to pmem/CMA/parts of ion
 * Anton Vorontsov is looking at the lowmemory killer
 * Greg has put some Android patches into mainline (under drivers/staging/android) previously
 * Greg put some Android patches in mainline under drivers/staging/android in Dec. 2011
 * Paul McKenney - kicking around ideas for dealing with wakelocks single global lock (dec. 2011)

Plans

 * Set up mailing list - Tim is working on it - probable name: ce-android-mainline@list.linuxfoundation.org
 * Set up meeting at Linaro Connect or ABS - Tim (with Deepak and/or Jesse's help)
 * Update this page with latest info (for December 2011) - Tim
 * Make a general announcement of the project to celinux-dev and linux-embedded - Tim

Progress Chart
This section is intended to show our progress, by showing the patch set size over time. With any luck, as we get features into mainline, the difference between the Android kernel and the legacy Linux kernel will shrink.


 * diff of 2.6.29 kernel.org tree versus kernel