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[209.85.128.179]) by smtp.gmail.com with ESMTPSA id p188-20020a0dcdc5000000b005777a2c356asm3159539ywd.65.2023.09.19.06.34.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 19 Sep 2023 06:34:20 -0700 (PDT) Received: by mail-yw1-f179.google.com with SMTP id 00721157ae682-59e8d963adbso26129427b3.0; Tue, 19 Sep 2023 06:34:20 -0700 (PDT) X-Received: by 2002:a0d:cc55:0:b0:59b:cb53:ad5a with SMTP id o82-20020a0dcc55000000b0059bcb53ad5amr12005299ywd.35.1695130459846; Tue, 19 Sep 2023 06:34:19 -0700 (PDT) MIME-Version: 1.0 References: <87edj64rj1.fsf@oracle.com> <87zg1u1h5t.fsf@oracle.com> <20230911150410.GC9098@noisy.programming.kicks-ass.net> <87h6o01w1a.fsf@oracle.com> <20230912082606.GB35261@noisy.programming.kicks-ass.net> <87cyyfxd4k.ffs@tglx> <87led2wdj0.ffs@tglx> In-Reply-To: From: Geert Uytterhoeven Date: Tue, 19 Sep 2023 15:34:08 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Arches that don't support PREEMPT To: Matthew Wilcox Cc: Thomas Gleixner , Linus Torvalds , Peter Zijlstra , Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, mgorman@suse.de, rostedt@goodmis.org, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, linux-m68k@lists.linux-m68k.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Brian Cain , linux-hexagon@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Willy, On Tue, Sep 19, 2023 at 3:01 PM 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 ... > > I suspect none of these architecture maintainers have any idea there's a > problem. Look at commit 87a4c375995e and the discussion in > https://lore.kernel.org/lkml/20180724175646.3621-1-hch@lst.de/ These links don't really point out there is a grave problem? > Let's cc those maintainers so they can remove this and fix whatever > breaks. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds