Received: by 2002:a05:6a11:4021:0:0:0:0 with SMTP id ky33csp1158164pxb; Thu, 23 Sep 2021 20:29:24 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxV9UPwT6bvAqaFNiFfi5qBDV1dOVp1cR52jPoF2sTKXdfKD+U2fUT6/K9iE8q4vwmeJR3j X-Received: by 2002:a05:6e02:1aa6:: with SMTP id l6mr6309240ilv.231.1632454164551; Thu, 23 Sep 2021 20:29:24 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1632454164; cv=none; d=google.com; s=arc-20160816; b=V8DH4eN6RIlAfl83FRvFDQ6I1cWkcka81R+uLALtWTxyuy5WaIq4YmDuc72LdB79uM 5DEFaaUcVRqQ24slMR40cj87odyUc+DZxXE9LJIY+22P6sEW7rO5gxzkvQGE3fLHneKV B6iMrZqAH99PlLcnkiNwECgICaHiGVcTe5dQJD6GQwUrOujciZOkE5+DMgFIlWwX836D /DYvizJCrHmDGOl7LssApBB/M6VUdzgyLkhHcIqX+ozl4eD4V2YfPTvVX+G6GE+zf+gz UDfTbpuuemS4qztkTHqcB92+/ip6MdL/LQD+iGVDoT4BQHLzOrnMyYrfqYgiUwyK9SG7 2vyQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=cQC6Mxe85efSCas7it10J3X99ZkZeK6RmQsFpaDK+ic=; b=W8AxO5RGgE6pL+8ygy7ToOk1T+3UHRCPwBsfbwyPw3loz3ikRm8ybBqNcCLTw/RQkH Sxl60GbBxU8wLbDGQt1MUlz9AWavF0CurSmmneWAMByxfCWrVVQT3oqMWv9l2M3iwYRg yJkGK+XLmvSr5+mxEIxkJizfrTu8A3Hh+trK2u/NnscSzlfqARAq+/SH7cuJeBUUDPSG NRpHmFTGeYlkgRYz7OLWBupYAKoG7UK37B1/UnZHKQV3n+8V/6cggPTvIqo7kjfi0ZHw 2OgGU8QM9vb1dKuo7LnqAODc/Sbj4Td8HK+jm42ibvQajRtMBzgKVWIh+/dO20nibV62 0tDA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id r17si8821943ilh.21.2021.09.23.20.29.11; Thu, 23 Sep 2021 20:29:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244018AbhIXD25 (ORCPT + 99 others); Thu, 23 Sep 2021 23:28:57 -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