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[209.85.214.178]) by smtp.gmail.com with ESMTPSA id u18-20020a170902e5d200b001c6052152fdsm3953883plf.50.2023.10.06.07.56.40 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 06 Oct 2023 07:56:40 -0700 (PDT) Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-1c5ff5f858dso17355735ad.2 for ; Fri, 06 Oct 2023 07:56:40 -0700 (PDT) X-Received: by 2002:a0d:e841:0:b0:589:f491:de9c with SMTP id r62-20020a0de841000000b00589f491de9cmr8896800ywe.28.1696603879221; Fri, 06 Oct 2023 07:51:19 -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: Fri, 6 Oct 2023 16:51:07 +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: quoted-printable X-Rspamd-Queue-Id: 912C020036 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: t5eubozjdnc39cka4zkjb8owrn9kmm8s X-HE-Tag: 1696604202-881139 X-HE-Meta: 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 F7/cMOSK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Willy, On Tue, Sep 19, 2023 at 3:01=E2=80=AFPM 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/ > > Let's cc those maintainers so they can remove this and fix whatever > breaks. Looks like your scare tactics are working ;-) [PATCH/RFC] m68k: Add full preempt support https://lore.kernel.org/all/7858a184cda66e0991fd295c711dfed7e4d1248c.169660= 3287.git.geert@linux-m68k.org Gr{oetje,eeting}s, Geert --=20 Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k= .org In personal conversations with technical people, I call myself a hacker. Bu= t when I'm talking to journalists I just say "programmer" or something like t= hat. -- Linus Torvalds