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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 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 AED29C433EF for ; Fri, 24 Sep 2021 03:27:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A33160F70 for ; Fri, 24 Sep 2021 03:27:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244025AbhIXD3B (ORCPT ); Thu, 23 Sep 2021 23:29:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:34126 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235369AbhIXD24 (ORCPT ); Thu, 23 Sep 2021 23:28:56 -0400 Received: from oasis.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B983F60EE0; Fri, 24 Sep 2021 03:27:23 +0000 (UTC) Date: Thu, 23 Sep 2021 23:27:22 -0400 From: Steven Rostedt To: =?UTF-8?B?546L6LSH?= Cc: Ingo Molnar , open list Subject: Re: [RFC PATCH] trace: prevent preemption in perf_ftrace_function_call() Message-ID: <20210923232722.4fc6f3fe@oasis.local.home> In-Reply-To: <20210923232619.50103473@oasis.local.home> References: <2470f39b-aed1-4e19-9982-206007eb0c6a@linux.alibaba.com> <20210923093359.30da8ba6@gandalf.local.home> <7f4dfb4a-d271-b3c5-f603-06cc789ba9e9@linux.alibaba.com> <20210923232619.50103473@oasis.local.home> X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 23 Sep 2021 23:26:19 -0400 Steven Rostedt wrote: > If it can be scheduled, then RCU is definitely watching ;-) In other words. Nothing ever gets scheduled into a location that RCU is not watching. -- Steve