Comment # 6 on bug 1185518 from Frederic Weisbecker

(In reply to Michal Hocko from comment #5)
> I do not remember the exact form this got in the end but do we have a way to
> have PREEMPT_NONE behavior by default without adding a kernel command line
> option with PREEMPT=y?

No indeed and other people outside recently asked me for that.
I can submit a patch for that if you like.