Kernel source and integrated kernel build

[lambdaupb]

`/builds/out/target/product/d855/boot.img'
build/core/tasks/kernel.mk:65: ***************************************************************
build/core/tasks/kernel.mk:66: * Using prebuilt kernel binary instead of source              *
build/core/tasks/kernel.mk:67: * THIS IS DEPRECATED, AND WILL BE DISCONTINUED                *
build/core/tasks/kernel.mk:68: * Please configure your device to download the kernel         *
build/core/tasks/kernel.mk:69: * source repository to kernel/lge/d855
build/core/tasks/kernel.mk:70: * See http://forum.xda-developers.com/wiki/ROM/Integrated_Kernel_Build
build/core/tasks/kernel.mk:71: * for more information                                        *
build/core/tasks/kernel.mk:72: ***************************************************************

I am investigating #3 and looked into jenkins, which produced this message.
Available kernel source would make reproducing and researching bugs much easier.

[lambdaupb]

@dadi11 maybe you could comment on the state of things.

[danparidae]

prebuilt kernel is needed to fit in small recovery partition (16mb) and it's compiling faster, takes less space etc.
btw I stopped working on encryption in my twrp version..

[lambdaupb]

Ok, I understand. Where can I find the source to the included kernel?

Other Snapdragon 801 devices like bacon (OnePlus One) have their kernel source in-tree and produce < 16MiB img files. Is there something different with G3 devices that plays into this?

Encryption is an important feature for me, especially since it is on by default in many cases now and adopted storage is using it as well.
Maybe I can help, I'm not a C dev, but i know my way around *nix.

[lambdaupb]

I redid the d855 port with a cm-13.0 build env and the normal overlay.
I finally got decrypt working, a build is attached as a release:

https://github.com/lambdaupb/android_device_lge_d855/tree/cm-13.0