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=-0.8 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 40DC4C433E0 for ; Tue, 23 Jun 2020 15:28:50 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A698F2070E for ; Tue, 23 Jun 2020 15:28:49 +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="Q2asf/D+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A698F2070E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 49rqtk6WPbzDqKf for ; Wed, 24 Jun 2020 01:28:46 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=peterz@infradead.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=merlin.20170209 header.b=Q2asf/D+; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 49rqpb4RgXzDqFs for ; Wed, 24 Jun 2020 01:25:11 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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=CdyXQj2K/WhL99i44E17m8NIjPfggDEZJpNq1YwlkZk=; b=Q2asf/D+1IaMFnf1i/OVF98de3 7rs3gVfXshkpsFSSEaP3Y7T3/jTzoRPpqVcpPUtnk9TLPRm/yqsLW5rzqU45RZvshYlmMrH648Bp+ +VOJgyFc0NC5Vs3bN8mgZAsW1mnElkGwPu5PAeUQupo9bWrU7jFZFfQc7FPoQxcaxz//lpCJDxhJD ZuHJZtkrYUFb3n/y9sZEBKLUqfwZkaGs+bglrCumueb5ZG54b/NxCLJJzXQmO9LxeKerFKX+t6AXz 6X8YpY8hQffzfIE7GoVgFOKPODFGi4aJCr3+VXGUB9CZeB/MY6yUCEz72sg0jKQIZ694RVvWzj7SD Plpff4LA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jnkn7-0003Pr-8v; Tue, 23 Jun 2020 15:24:53 +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 180DE303DA0; Tue, 23 Jun 2020 17:24:51 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id F17AC234EBA53; Tue, 23 Jun 2020 17:24:50 +0200 (CEST) Date: Tue, 23 Jun 2020 17:24:50 +0200 From: Peter Zijlstra To: "Ahmed S. Darwish" Subject: Re: [PATCH v4 7/8] lockdep: Change hardirq{s_enabled,_context} to per-cpu variables Message-ID: <20200623152450.GM4817@hirez.programming.kicks-ass.net> References: <20200623083645.277342609@infradead.org> <20200623083721.512673481@infradead.org> <20200623150031.GA2986783@debian-buster-darwi.lab.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200623150031.GA2986783@debian-buster-darwi.lab.linutronix.de> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, bigeasy@linutronix.de, x86@kernel.org, heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org, rostedt@goodmis.org, davem@davemloft.net, sparclinux@vger.kernel.org, linux@armlinux.org.uk, tglx@linutronix.de, will@kernel.org, mingo@kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jun 23, 2020 at 05:00:31PM +0200, Ahmed S. Darwish wrote: > On Tue, Jun 23, 2020 at 10:36:52AM +0200, Peter Zijlstra wrote: > ... > > -#define lockdep_assert_irqs_disabled() do { \ > > - WARN_ONCE(debug_locks && !current->lockdep_recursion && \ > > - current->hardirqs_enabled, \ > > - "IRQs not disabled as expected\n"); \ > > - } while (0) > > +#define lockdep_assert_irqs_enabled() \ > > +do { \ > > + WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirqs_enabled)); \ > > +} while (0) > > > > Can we add a small comment on top of lockdep_off(), stating that lockdep > IRQ tracking will still be kept after a lockdep_off call? That would only legitimize lockdep_off(). The only comment I want to put on that is: "if you use this, you're doing it wrong'.