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 X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 244C3C433E0 for ; Tue, 26 May 2020 09:11:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA53120787 for ; Tue, 26 May 2020 09:11:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="fPVI1/dS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731727AbgEZJLJ (ORCPT ); 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.