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

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Message-ID: <YCKmhnoSKgdYqxOL@hirez.programming.kicks-ass.net>
Date:   Tue, 9 Feb 2021 16:13:10 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Galbraith <efault@....de>
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, Feb 09, 2021 at 02:45:37PM +0100, Mike Galbraith wrote:
> 
> PREEMPT_RT and PREEMPT both needs PREEMPT_DYNAMIC to build, so move
> selection of PREEMPT_DYNAMIC to the common denominator, PREEMPTION.

I'm confused, why would you want PREEMPT_DYNAMIC for PREEMPT_RT ?

PREEMPT_RT without full preemption is just plain daft, no?