Support of other architectures (!= x86_64)

[FAMILIAR-project]

Right now, we have focused on x86_64 architecture and we're usually presetting this option with randconfig In fact there is an option called --seed that allows one to set specific pre-set options' values. On large scale experiments, we're doing something like this: python3 kernel_generator.py --dev 200 --linux_version 5.8 --local --seed x86_64.config

see https://github.com/TuxML/tuxml/blob/master/compilation/compiler.py#L213 https://github.com/TuxML/tuxml/blob/master/compilation/x64.config https://github.com/TuxML/tuxml/blob/master/compilation/settings.py#L15 (for tiny/randconfig)

what's a bit intuitive is that by default there is https://github.com/TuxML/tuxml/blob/master/compilation/tuxml.config that is systematically used (default seed). It was partlly used for 4.13.3 and 4.15 for preventing some bugs. It's a legacy we should remove.

We need to:

• [x] change the tuxml.config as the default seed
• [x] I dislike the "seed" terminology, one needs another term like "preset"
• [x] experiment different architectures (thus preset) such as arm. However it would certainly require cross-compilation support and so new Docker images (eg https://github.com/kernelci/kernelci-core/blob/main/jenkins/dockerfiles/gcc-8_arm/Dockerfile). I suggest to try experimenting with x86_32 (which is another closed architecture) and then others like arm

[acherm]

requires some experiments, but arch support is basically here now.