Re: [patch] preempt: select PREEMPT_DYNAMIC under PREEMPTION instead of PREEMPT

[Mike Galbraith]

On Tue, 2021-02-09 at 17:13 +0100, Peter Zijlstra wrote:
> On Tue, Feb 09, 2021 at 05:05:14PM +0100, Mike Galbraith wrote:
>
> > ld: init/main.o: in function `trace_initcall_start':
> > /backup/usr/local/src/kernel/linux-tip-rt/./include/trace/events/initcall.h:27: undefined reference to `__SCT__preempt_schedule_notrace'
>
> Ooohh... this is because x86 can't build PREEMPT without PREEMPT_DYNAMIC
> anymore. Maybe I should fix that. Lemme see what that would take.

Uhoh, looks like something a lot worse managed to sneak into master.
While test-driving that tip-rt build, I couldn't help noticing that
evolution is going mad, chewing cpu and being useless enough that I
couldn't reply to you.  Unfortunately, it ain't my tip-rt tree, nor is
it virgin tip, the evilness is present in virgin master, but not in
5.10 stable.  Hohum, a hunting I shall go I suppose.

	-Mike