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 68E09C2BA83 for ; Wed, 12 Feb 2020 09:43:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 33F61206ED for ; Wed, 12 Feb 2020 09:43:51 +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="Gvbxpj63" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729011AbgBLJnu (ORCPT ); Wed, 12 Feb 2020 04:43:50 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:46606 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728637AbgBLJno (ORCPT ); Wed, 12 Feb 2020 04:43:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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=bTlY8PGhCYzSVjFt/mma9u9atqHaB4/S7WhFaJNCETg=; b=Gvbxpj63SlusCN6Dzw/w+tioui mXMS+wYeKZCzpl6vh67GQ+rpdH7w6KiKvpCvDWPH/uS8XV9qVxx6xB4pRowPtkTdAF5ABCLWeeWBE ANsB7ynEG0r0w3FjgH6cou7mHRzj/dB1eE8/8EKUgla/zDd4xApPGTM7Dar0azLbDzvInm5U6uIAs fMnUAp2t9yJvEY1xs+KUd2AGBGcsmA9ahlje2GJ/oIvUACaynNgc1UzsjXe2Y2bNmnM2OakRsrMYN SiPg9Th3zeyU6hwLa9xvjEMuy0aTrjpz6SyWo6JDhoHfSnBmfYWRsKNRwwHbZtlnWwVNQdezKUWl9 MhFfW5pg==; 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 1j1oYG-0006zW-9T; Wed, 12 Feb 2020 09:43:24 +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 5C6D03077DC; Wed, 12 Feb 2020 10:41:32 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 46FA720148932; Wed, 12 Feb 2020 10:43:21 +0100 (CET) Message-Id: <20200212093210.468391728@infradead.org> User-Agent: quilt/0.65 Date: Wed, 12 Feb 2020 10:32:10 +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 0/8] 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(). I've only fixed x86, but quickly gone through other architectures and there is definitely more stuff to be fixed (simply grep for nmi_enter in your arch).