Received: by 2002:ab2:6486:0:b0:1ef:eae8:a797 with SMTP id de6csp121985lqb; Fri, 15 Mar 2024 18:23:45 -0700 (PDT) X-Forwarded-Encrypted: i=3; AJvYcCU5lIgSFgCh7v8P2JAzc+mGGwvCK1c4BGkUxruMMnAqwuQnnVFY0VjP30PNC/93h+5eJFHBoXcZHNsw4mGhUOtouputriOshESgqWalvA== X-Google-Smtp-Source: AGHT+IGDnHizA+2uodEyU47xv+i1dU9GZRBtEDCvTkOLQPTofSe0x+uuWmeCmg6UiFXOckvoHR0W X-Received: by 2002:adf:fa87:0:b0:33e:7946:4cd2 with SMTP id h7-20020adffa87000000b0033e79464cd2mr3290389wrr.10.1710552225137; Fri, 15 Mar 2024 18:23:45 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1710552225; cv=pass; d=google.com; s=arc-20160816; b=haWq2p76v+rLXkW8aV96byJa+PXXXCD+olyeXqnVduMNV0ZBVwBMbWvOjBP/joxB2g Lm7tBSSSbEUTOeh21wiM6/Wle7M7GQXjxps/mLX4eh/my1Er4l0DSTv9aAQPwXIEdsli YQbfFYCB+6HhgsmxAlJ2WNIIUNwzfIqHtVnEGhhqQRUtJpD16NM+OV2REw2PrdCtxyvi l7N/88gNKlSZpPaRaNwv1sI/+qtcW2n0BAC6JKtLc8OC4aQPS+tMUc9koFEdA45JQG/K 3wCSVjGMf/RRRQHTlKQviCoRfZ9JOrdJuC2SqE2AQ3bAUptdVAFMYZqwsQU5rwUGnTww ORCA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:list-unsubscribe:list-subscribe:list-id:precedence :dkim-signature; bh=69cI/hdQb0CMrhhOHzUcjMzxCnMmxWubP/uXkL4m1gc=; fh=hJNScmTrbzbC/zv1rXNxyd4E3PJFMHx2zoBPeCJ6MMw=; b=ysaGm53GhC45xBKeXeaq27Xgvu+Vw5zvtk+CKfLaMrKZbk/LbMqWxchRY1GfCTEZIu roOYlH7w1yvYz87p9GRsQHVUnVyUAnZ+G+CAcW2RC3M2IxZldEur0obnsiTvrbF5zt8F 7olUzF/4dLZ9LODs3qBJ0YtQbh+jyn8Wwv44EAXrgvYZgZf1B/7cRjRlhpGcTZ61+xxK hS70AYvl+hbLfMiIT8QfmRkucEhaAnm1xGzmXBROCC8VCr2xiCNsGVwyYFuA0y2bFrh+ vcjLcIGH15o1vD3xU+eoQPfSQuWj4Ngcb0lbkV+Bcds94jXarQhl4ECa2g0amvE4lnkD 5V8A==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=google header.b=N9ojlGze; arc=pass (i=1 spf=pass spfdomain=linuxfoundation.org dkim=pass dkdomain=linuxfoundation.org dmarc=pass fromdomain=linuxfoundation.org); spf=pass (google.com: domain of linux-kernel+bounces-105028-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-105028-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Return-Path: Received: from am.mirrors.kernel.org (am.mirrors.kernel.org. [147.75.80.249]) by mx.google.com with ESMTPS id q5-20020a056402248500b00568c18ba317si28703eda.610.2024.03.15.18.23.45 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Mar 2024 18:23:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-105028-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=google header.b=N9ojlGze; arc=pass (i=1 spf=pass spfdomain=linuxfoundation.org dkim=pass dkdomain=linuxfoundation.org dmarc=pass fromdomain=linuxfoundation.org); spf=pass (google.com: domain of linux-kernel+bounces-105028-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-105028-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id B0CA21F226F6 for ; Sat, 16 Mar 2024 01:23:44 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A9D2A4C7C; Sat, 16 Mar 2024 01:23:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="N9ojlGze" Received: from mail-ed1-f43.google.com (mail-ed1-f43.google.com [209.85.208.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2D4DD4A22 for ; Sat, 16 Mar 2024 01:23:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710552213; cv=none; b=UPEemftc6Uf72SD5DZk8nCnt3kqHsh/0x++xB64gKiMI1OiRoyFdD5LKDQSsnKwHrfhvU76CDAeyFPYzJkJwlEJf8UuG+7hCQHnbCKGQjhBEfbU4TsiFAJ36EOBhU8rzdLEii1gIT8xdmPThCRgTdK9uMWf/gJLa0oktF1Qhw4M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710552213; c=relaxed/simple; bh=zrk0mlljUXq6JrTr3qaP5fW3ShetdUZodGHSY6f3a6o=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=uIfqGUy+z52tF9TkR8djK11Qxidc2f8EIRk4ZPx8yBgQSn1XF5QXacwhcy10wOI2ToLQuHbgaIAfs568n3UgYqEjDbBsOyzGsc2emNg5U+qcc9OHSUvr2NoyM0bxWTaS1JdcT+WXGom5MJtrl4B/9QlowlFWojGQVEkk8njKukQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linuxfoundation.org; spf=pass smtp.mailfrom=linuxfoundation.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=N9ojlGze; arc=none smtp.client-ip=209.85.208.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linuxfoundation.org Received: by mail-ed1-f43.google.com with SMTP id 4fb4d7f45d1cf-5684c3313cdso3240854a12.3 for ; Fri, 15 Mar 2024 18:23:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; t=1710552210; x=1711157010; darn=vger.kernel.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=69cI/hdQb0CMrhhOHzUcjMzxCnMmxWubP/uXkL4m1gc=; b=N9ojlGze6DfF2yy0ie+4jvUiWOhTWE2Emqd5XhR5TRA75MiQdbNH7q+5hA8SoxY5EY 0HMxoeFwtvPUxIQZYskqqOifKTqSTC1gj0MB64uJ4feEXCR58C4EMsvrj2OQM8bdSBVD CKZxyPE3h/9jWpI8OnjkINJZPcUucz7MDNQA4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710552210; x=1711157010; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=69cI/hdQb0CMrhhOHzUcjMzxCnMmxWubP/uXkL4m1gc=; b=tJIF0t/Gt6Le2iblo+kO1nQ303WGV0kaqrIFfRfYH/N6Cgf3qmRENppor28XHxwOKf ijD5t9VFfuLfxIO+dfD1AHFn1ArRIjl0yOTMjuDoby7YJgoPt6l0Vsyx7RgmqTxrQp27 tZZ1RwRyt1swMer1jPJxpM9IJX5NfEOiLM7f5caP1rrfazc9FaXrBHkSd5i6rXMB4sY6 SjbUaG+A/ZprBIpryWwQO3k+NFT1iFv8dV2N6iOOco6Hc2XfJjfdgWw6xtJqr7szcQBA 1BdwaBqw2maljTl6ydFC40loEjuw2QlFrIBU1f4+Qk85b87n/nNxAtRJ69D++IRzj2dA 1VVw== X-Forwarded-Encrypted: i=1; AJvYcCWoEi7keoblfrFmKHgM+/BCXKGhaMXGH38Z6KFapmTbSalP79gqy7ik7ato0A3CJCdnpyxpqHKlzN6LDZSmfR1OWV/ZZQT4gagHLvwf X-Gm-Message-State: AOJu0Yzq1z2w1P3CyhDyDYYZKjOpQ/Mjg3J0AA56WnAyUGEqhiyZaoL4 Lccm5tanJl+1YPgK6P6F8tsgf6d1CZlLnBVDShFec0VoVdvM4TExnStzRnMD0V7cXr2URuczFd2 hE6xZ3A== X-Received: by 2002:a17:906:508:b0:a43:f587:d427 with SMTP id j8-20020a170906050800b00a43f587d427mr2550612eja.34.1710552210430; Fri, 15 Mar 2024 18:23:30 -0700 (PDT) Received: from mail-ej1-f47.google.com (mail-ej1-f47.google.com. [209.85.218.47]) by smtp.gmail.com with ESMTPSA id sd9-20020a170906ce2900b00a4628cacad4sm2201368ejb.195.2024.03.15.18.23.29 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Mar 2024 18:23:29 -0700 (PDT) Received: by mail-ej1-f47.google.com with SMTP id a640c23a62f3a-a4644bde1d4so343840166b.3 for ; Fri, 15 Mar 2024 18:23:29 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCXHKs/JwijisHHOnn6I33YWwwYvN8BKqvjn31OuSf4rWKmq9sHZMiuUocwvv5gyVQ33OlUXGrQAiQcxpDI0/9YU2jVEleDLq2YkEdiC X-Received: by 2002:a17:906:3654:b0:a46:9711:4f04 with SMTP id r20-20020a170906365400b00a4697114f04mr1417533ejb.13.1710552209212; Fri, 15 Mar 2024 18:23:29 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240303235029.555787150@linutronix.de> <20240304005104.622511517@linutronix.de> <87y1ajjsv9.ffs@tglx> <87o7bfjeae.ffs@tglx> <877ci3j80k.ffs@tglx> In-Reply-To: <877ci3j80k.ffs@tglx> From: Linus Torvalds Date: Fri, 15 Mar 2024 18:23:12 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch 5/9] x86: Cure per CPU madness on UP To: Thomas Gleixner Cc: Guenter Roeck , LKML , x86@kernel.org, Uros Bizjak , linux-sparse@vger.kernel.org, lkp@intel.com, oe-kbuild-all@lists.linux.dev, Arnd Bergmann Content-Type: text/plain; charset="UTF-8" On Fri, 15 Mar 2024 at 18:11, Thomas Gleixner wrote: > > You wish. We still support 486 and some of the still produced 486 clones > do not have a local APIC. Ouch. I was _sure_ we had dropped i486 support too due to cmpxchg8b. But apparently that was just a discussion, and my wishful thinking, and we never actually followed through. Linus