Received: by 2002:a25:2c96:0:0:0:0:0 with SMTP id s144csp8165ybs; Tue, 26 May 2020 02:13:54 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxAZk4lBRcrRH4nf9RdT8Cor9qA/x5aU1K03arnpeHSBCJlXE8XlBInKtgfwQDt9Uoknu9J X-Received: by 2002:a17:907:40c7:: with SMTP id nv7mr277938ejb.16.1590484433941; Tue, 26 May 2020 02:13:53 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1590484433; cv=none; d=google.com; s=arc-20160816; b=leEQCsOxYx19FSgLkMxq2X9N9ZJn+zD1fXfPvsccpQan63cFpOMYxPdJLhvgCyHQ1G zpPmvqMISUTldsTNWusIYiUSHUJdJ0VI0ukH9bdDSdW4dGmmoC9Cd52FF8zqhno+aKQS MR6zQfPvBFrSEEvPF1U/F0gEaXnIdknlEnmteSMfpaoDK+CVq2y3eqwkDnTfSs5cW14U mWe7aMyjQO1Icn+vKuSd18TnEnPzhUOWhj60Limzno0PBxpAepxq+U5UfOybWBHS13TA KI7MnHmBV7dpZ2aZXpUQZC904M528cN+w4+nDyU7S04tK3m3FozlJ/48zwctOxZvy7Hz rxHw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :dkim-signature; bh=2e5NXHGx7wnm7Pbp2AIyimNQk/VuymIdJNBxaSRbD1E=; b=NIxvBtZ+yYO4oM0ZVX5uxNjOlfgAKPNwrSlWM+g1el7Axn6aAZJ2/W2krPTG64vWCD 0U1f3wY0vv7zX/7NvyD7A8HcbYmVIJB4YAub1z7zQvCTnPir3e6BYMnOSL0RmCf8cK2Y Z6WtNt5Woc4zoPnGAjFFAxtfR7LV0N6i3zp/oApzNAnonr2tJOawgGl9cM3VaNsQ7t6r P1wMHn11+9MPZ1tfsRvNAHAWjHkp5a4Ba/KcfIhO9VDxyeZhalqAI1TnKKPUamwQqj0d wAvhGrsM3+TJE4YAxtLHT7nOkkWvBhKke/bopIQn7+d/p3AzSudCNSK/smgpKZyjHT/V 3xAg== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="fPVI1/dS"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id ss21si10842732ejb.124.2020.05.26.02.13.30; Tue, 26 May 2020 02:13:53 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="fPVI1/dS"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731688AbgEZJLJ (ORCPT + 99 others); Tue, 26 May 2020 05:11:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731491AbgEZJLI (ORCPT ); Tue, 26 May 2020 05:11:08 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE580C03E97E for ; Tue, 26 May 2020 02:11:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=2e5NXHGx7wnm7Pbp2AIyimNQk/VuymIdJNBxaSRbD1E=; b=fPVI1/dS5WYyPDxVtdVBcoztyN Rojdzyhejq+iCGndokjTFBod58VOqYbWbgaLQd5nJiVV49NN07q7lRqW6gu919smdhE9iARRxmxop bZu4XUu3cTr+E57Jy9SFhgq4GP/Jpeiaq/mj6I+7+7KWqtWANWvp4n7CMhrDw3qwzY94JFd+VhYLo dKV6kdPZNWmseW2PgN+kDFoMEiDQpngS7RWKprKVD8OSjNAyvnl7SnUUwuL76u9GsyQH9nuaszVsv Tc1r81orxm2Gi52XrxkEHpbiggKaY7RSbSHjXOQrW2l38DGQmL8yzZoTFIsZuC8l6ABexT3kmYMjT yCo5f/cA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jdVbk-0002nC-6O; Tue, 26 May 2020 09:10:48 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id F021D304DB2; Tue, 26 May 2020 11:10:45 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D87012B0A2A27; Tue, 26 May 2020 11:10:45 +0200 (CEST) Date: Tue, 26 May 2020 11:10:45 +0200 From: Peter Zijlstra To: Lai Jiangshan Cc: linux-kernel@vger.kernel.org, Andy Lutomirski , Thomas Gleixner , x86@kernel.org, Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Andrew Cooper , Juergen Gross , Brian Gerst Subject: Re: [RFC PATCH V2 5/7] x86/entry: don't shift stack on #DB Message-ID: <20200526091045.GB325280@hirez.programming.kicks-ass.net> References: <20200525152517.GY325280@hirez.programming.kicks-ass.net> <20200526014221.2119-1-laijs@linux.alibaba.com> <20200526014221.2119-6-laijs@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200526014221.2119-6-laijs@linux.alibaba.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 26, 2020 at 01:42:19AM +0000, Lai Jiangshan wrote: > debug_enter() will disable #DB, there should be no recursive #DB. should being the operative word. I have similar patches but was still debating what to do about kgdb, I think we'll just have to mark it BROKEN for now.