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=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT autolearn=ham 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 738B2ECDFB1 for ; Tue, 17 Jul 2018 11:28:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2005520C0E for ; Tue, 17 Jul 2018 11:28:49 +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="MBHSYcHM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2005520C0E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731523AbeGQMA5 (ORCPT ); Tue, 17 Jul 2018 08:00:57 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:39862 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730591AbeGQMA5 (ORCPT ); Tue, 17 Jul 2018 08:00:57 -0400 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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=cvcn4gVpyLiDlJfZfHSdxhQOBK2zvNc0GP6oJvtUq0Y=; b=MBHSYcHMg8/XqYmb0LBeBlz7X SV9sUR89Pm3kmk1X2k/vvvMzhSLAkTAYSFy/bFP4kbw5zz64Ts6gifHSZnKtDqibTSnTp1+88YAxI blga8k9dbn/Egp3aVDNSAgyuWj46rC38UOvKPmYnnxIIBeg1kYjvRCJ2uh1V4iUhXAV9tPU76OsWL Zla+HnAU9txBcUcBZuZcK5rUqsi/QjsextrMPIrDF4ppzv3+bG4qV3/C7TJEm8Iq1d033O5bs4EaI eH5Zp+rhFIBChqVseFIG4BvVU8dfrel5ny6Zd43SRIFicMYCIRyDrE2yPIJdQoE4GTGBYcIJFu6w2 TcxhkBOOQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1ffO9s-0005U6-Ga; Tue, 17 Jul 2018 11:28:44 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 3698420275F3B; Tue, 17 Jul 2018 13:28:42 +0200 (CEST) Date: Tue, 17 Jul 2018 13:28:42 +0200 From: Peter Zijlstra To: Julien Thierry Cc: Thomas Gleixner , linux-kernel@vger.kernel.org, ricardo.neri-calderon@linux.intel.com, marc.zyngier@arm.com, mingo@kernel.org Subject: Re: [RFC PATCH 1/4] genirq: Provide basic NMI management for interrupt lines Message-ID: <20180717112842.GT2476@hirez.programming.kicks-ass.net> References: <1531152846-19374-1-git-send-email-julien.thierry@arm.com> <1531152846-19374-2-git-send-email-julien.thierry@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 17, 2018 at 12:13:44PM +0100, Julien Thierry wrote: > I'm a bit unsure about this one. In practice NMI handlers shouldn't take > forever nor block the system for too long. On x86 at least, kgdb can be in NMI context for extended periods. Not saying that's a good thing, but on occasion we get reports on stuff coming apart because of that. (most times we tell people to not do that then)