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

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Date:   Tue, 09 Feb 2021 17:27:16 +0100
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch] preempt: select PREEMPT_DYNAMIC under PREEMPTION
 instead of PREEMPT

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