From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20754CD5BD4 for ; Tue, 19 Sep 2023 15:17:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 947546B0559; Tue, 19 Sep 2023 11:17:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8F7306B055A; Tue, 19 Sep 2023 11:17:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7BD6E6B055B; Tue, 19 Sep 2023 11:17:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 6D3386B0559 for ; Tue, 19 Sep 2023 11:17:28 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 3BF6080C65 for ; Tue, 19 Sep 2023 15:17:28 +0000 (UTC) X-FDA: 81253700976.16.FAD24EC Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf09.hostedemail.com (Postfix) with ESMTP id 71168140020 for ; Tue, 19 Sep 2023 15:17:26 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=xfTYwe+E; dkim=pass header.d=linutronix.de header.s=2020e header.b=1eCCtDGK; dmarc=pass (policy=none) header.from=linutronix.de; spf=pass (imf09.hostedemail.com: domain of tglx@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=tglx@linutronix.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1695136646; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ziuwOLCbw6a4ZLSyQtFECkdi5DpyFdO1Yq7Iy0MyDm0=; b=y7JedyhRdZbB4IfndhLn8Kc2+ThORlkw+0y1fCh1us2oW4IOpYQkuj2lnoU5QsCys1K3zJ zyyc00gWzqRN1nRUkjcEm126hwmPZqpBwQbvuqIfv0psveNcyFrHWaSKo8pyRlycGeIGOw Dz90aqbl315VRaLgs8OU6li0MGC8e5c= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=xfTYwe+E; dkim=pass header.d=linutronix.de header.s=2020e header.b=1eCCtDGK; dmarc=pass (policy=none) header.from=linutronix.de; spf=pass (imf09.hostedemail.com: domain of tglx@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=tglx@linutronix.de ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1695136646; a=rsa-sha256; cv=none; b=tcSlLuHk/UkHBLHzmSkE1VqOQLUFjHNinJxM3XzYwfaXq3UyOX8hd6CfsdNO0wx5yTskK1 ohg8GVpVSyrLJJSuVzrjQ6uXxFbbVK+1BPRptmU6BrEf6MYTeQjAfI7+na+asv7svpes+V +zUmn6kgRfOhmtosPzAaxeAifyQ+THA= From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1695136644; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ziuwOLCbw6a4ZLSyQtFECkdi5DpyFdO1Yq7Iy0MyDm0=; b=xfTYwe+EZSOhJ5ZWyANndueq2hUu/L4a8CM1/oAoRZtzh4dXrcGLYGZmFDRlRbbmYt7Vk5 q2a8s67GoVgkH/vtyTkmPv/zMoH9BYGxAEHj2NTitWpnBbFutuNDI6H1JPYV43N7FKxaoQ 4hC/61NGBBGSMcuN2eSwwtsASqR3q3H06Cy7Z7rF614qv6pL1DZ+t3J4cwWM4+dA2YExPS Yj2UGnTJ24Wa6zHkGlCKoO+Zi6tBfDavDhwHUDdHZm3LfgYdhB7jLgydTPgxJk5eQXI5DE 90AM6SeB7t4A+rORL9BVHHLD86RdMOvst214XGduAHjS54S1ZtgQLqiA15ULdw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1695136644; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ziuwOLCbw6a4ZLSyQtFECkdi5DpyFdO1Yq7Iy0MyDm0=; b=1eCCtDGKEUrDxtL8LY3g3sZgbE2u2Gi+z3OLPbxme25w5xD5smNfNB+DrDuC//vli78Ete kk+DBO2N6UphuqAw== To: Anton Ivanov , Peter Zijlstra , John Paul Adrian Glaubitz Cc: Matthew Wilcox , Linus Torvalds , 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 , 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: Re: Arches that don't support PREEMPT In-Reply-To: References: <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> <0e69f7df80dc5878071deb0d80938138d19de1d1.camel@physik.fu-berlin.de> <20230919134218.GA39281@noisy.programming.kicks-ass.net> Date: Tue, 19 Sep 2023 17:17:23 +0200 Message-ID: <87y1h2ur98.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Queue-Id: 71168140020 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: 8sfn46jqex98px9dbtewaf57byfurcta X-HE-Tag: 1695136646-856568 X-HE-Meta: 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 l/G7SKjq CcFT119ApVl1bUxh1leXhmkG/L+klSsDtlAFkalNJ4mx2ZTg= 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 15:21, Anton Ivanov wrote: > On 19/09/2023 14:42, Peter Zijlstra wrote: >> If you're working on one of them, then surely it's a simple matter of >> working on adding CONFIG_PREEMPT support :-) > > In the case of UML adding preempt will be quite difficult. I looked at > this a few years back. What's so difficult about it? Thanks, tglx