linux-kernel - Re: [patch 0/8] core, x86: Preparatory steps for RT

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Date:   Sat, 27 Jul 2019 08:16:09 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [patch 0/8] core, x86: Preparatory steps for RT

On Fri, 26 Jul 2019, Steven Rostedt wrote:

> On Fri, 26 Jul 2019 23:19:36 +0200
> Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
> > CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
> > functionality which today depends on CONFIG_PREEMPT.
> > 
> > The following series adjusts the core and x86 code to use
> > CONFIG_PREEMPTION where appropriate and extends the x86 dumpstack
> > implementation to display PREEMPT_RT instead of PREEMPT on a RT
> > enabled kernel.
> >
> 
> Hmm, I'm looking at v5.3-rc1 and I don't see a CONFIG_PREEMPTION
> defined. And the first patch doesn't define it. Did I miss a patch
> series that adds it?

It came right after rc1. The initial commit renamed PREEMPT to PREEMPT_LL
and seletced PREEMPT, but that broke defconfigs and make olddefconfig :(

And in fact it was a good thing that I had to stare at all CONFIG_PREEMPT
dependencies. Found some interesting things already :)

Thanks,

	tglx