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

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Date:   Tue, 19 Sep 2023 15:37:24 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Matthew Wilcox <willy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.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,
        rostedt@...dmis.org, 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, 2023-09-19 at 14:00 +0100, Matthew Wilcox wrote:
> On Tue, Sep 19, 2023 at 02:30:59PM +0200, Thomas Gleixner wrote:
> > Though it just occured to me that there are dragons lurking:
> > 
> > arch/alpha/Kconfig:     select ARCH_NO_PREEMPT
> > arch/hexagon/Kconfig:   select ARCH_NO_PREEMPT
> > arch/m68k/Kconfig:      select ARCH_NO_PREEMPT if !COLDFIRE
> > arch/um/Kconfig:        select ARCH_NO_PREEMPT
> 
> Sounds like three-and-a-half architectures which could be queued up for
> removal right behind ia64 ...

The agreement to kill off ia64 wasn't an invitation to kill off other stuff
that people are still working on! Can we please not do this?

Thanks,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
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