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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qiaLW-00HLve-Gs; Tue, 19 Sep 2023 13:00:54 +0000 Date: Tue, 19 Sep 2023 14:00:54 +0100 From: Matthew Wilcox To: Thomas Gleixner Cc: 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, Geert Uytterhoeven , 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 Subject: Arches that don't support PREEMPT Message-ID: 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87led2wdj0.ffs@tglx> X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 2EE31180013 X-Stat-Signature: gdnwnard4jadskbtqz9wsc5x8kew3rgu X-HE-Tag: 1695128477-126234 X-HE-Meta: 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 KO5+f6tm 3m/Oid7va5v8a75r3fl7xT8IS1/5gtLstcIhCDhBURgDUqThpHURV269t6W3zXPazivgEAn3Dr4ImCFtvogIBUSuCmuEAJQckuHYEJ7WPpPc9YK/31YBe/NI6tydlonG/GJiCjdW+z1nqUD/6w6ug6dDrL6JAqZKKzXwFyuHSufNNE/JbrrrlsvOOT2gAfCZSPGsL 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: 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.