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 408E5C352A4 for ; Wed, 12 Feb 2020 21:14:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 13F0E206D7 for ; Wed, 12 Feb 2020 21:14:12 +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="GcUXw9JK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729195AbgBLVOL (ORCPT ); Wed, 12 Feb 2020 16:14:11 -0500 Received: from merlin.infradead.org ([205.233.59.134]:33414 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728674AbgBLVOI (ORCPT ); Wed, 12 Feb 2020 16:14:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Subject:Cc:To:From:Date:Message-Id: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To:References; bh=NDPamACi2y3JNfAuuZKbQohXItpap+A5gFGcdigl8YU=; b=GcUXw9JKL+61en5oLNNM3Phx1s N4U3vvOH2T+shLsk3ohhM0AK0snp7i1qHZEWzsAuekXFU4blKQ1IERv0AefmUUNMV6NA7isUnFYwV YimPfkTjuHDVcf3h/b/luKiOTcBoHMB5fj2wEvnz79TzTQ2cp3JuJ7q5V//WHrTDrbOarGDLzLcjb 4QT8pv/aaL1hdPj4eFi/f/QpFIP09mD5eIOYQKZ+BabN0pNEmxD8Dvt0/0LGhb7cDRzyfFM7cvVxm PHd100srBvEHeYP7DDC6zCu7gyWjSBjGj5VKtZLTYkPvfYD6FYilaCtfQqqvv1ddytHJwaaWwj6cY hV/S8Tlw==; 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 1j1zKK-0002Kh-Jr; Wed, 12 Feb 2020 21:13:44 +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 3B28230066E; Wed, 12 Feb 2020 22:11:52 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 707ED203A8994; Wed, 12 Feb 2020 22:13:41 +0100 (CET) Message-Id: <20200212210139.382424693@infradead.org> User-Agent: quilt/0.65 Date: Wed, 12 Feb 2020 22:01:39 +0100 From: Peter Zijlstra To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, rostedt@goodmis.org Cc: peterz@infradead.org, mingo@kernel.org, joel@joelfernandes.org, gregkh@linuxfoundation.org, gustavo@embeddedor.com, tglx@linutronix.de, paulmck@kernel.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com Subject: [PATCH v2 0/9] tracing vs rcu vs nmi Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, These here patches are the result of Mathieu and Steve trying to get commit 865e63b04e9b2 ("tracing: Add back in rcu_irq_enter/exit_irqson() for rcuidle tracepoints") reverted again. One of the things discovered is that tracing MUST NOT happen before nmi_enter() or after nmi_exit(). Audit results of the previous version are still valid. Changes since -v1: - Added tags - Changed #4; changed nmi_enter() to use __preempt_count_add() vs marking preempt_count_add() notrace. - Changed #5; confusion on which functions are notrace due to Makefile - Added #9; remove limitation on the perf-function-trace coupling