linux-kernel - Re: Arches that don't support PREEMPT

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Message-ID: <20230919113108.1c988906@gandalf.local.home>
Date:   Tue, 19 Sep 2023 11:31:08 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org, mgorman@...e.de,
        jon.grimm@....com, bharata@....com, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        jgross@...e.com, andrew.cooper3@...rix.com,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org, Brian Cain <bcain@...cinc.com>,
        linux-hexagon@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org
Subject: Re: Arches that don't support PREEMPT

On Tue, 19 Sep 2023 15:32:05 +0100
Matthew Wilcox <willy@...radead.org> wrote:

> On Tue, Sep 19, 2023 at 04:24:48PM +0200, John Paul Adrian Glaubitz wrote:
> > If the conversion isn't hard, why is the first reflex the urge to remove an architecture
> > instead of offering advise how to get the conversion done?  
> 
> Because PREEMPT has been around since before 2005 (cc19ca86a023 created
> Kconfig.preempt and I don't need to go back further than that to make my
> point), and you haven't done the work yet.  Clearly it takes the threat
> of removal to get some kind of motion.

Or the use case of a preempt kernel on said arch has never been a request.
Just because it was available doesn't necessarily mean it's required.

Please, let's not jump to threats of removal just to get a feature in.
Simply ask first. I didn't see anyone reaching out to the maintainers
asking for this as it will be needed for a new feature that will likely
make maintaining said arch easier.

Everything is still in brainstorming mode.

-- Steve