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=-4.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 2AF16C43461 for ; Mon, 7 Sep 2020 17:45:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E073C206E7 for ; Mon, 7 Sep 2020 17:45:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="JoZncW88" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729767AbgIGRpY (ORCPT ); Mon, 7 Sep 2020 13:45:24 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:51725 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731485AbgIGRof (ORCPT ); Mon, 7 Sep 2020 13:44:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599500673; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=tbJAEmbnhj5tfQXq87hCWAEhP8FiF1I1Gv0tPdPnVrE=; b=JoZncW88Of3JBpUbqHf1NZzDfDq5QId5o+UQkq7+jqyGVWCANihv2Eh+TFShiw7XkE0B0a 4oePdDr5IkU6LGS8iQoo8LIlVFbNdiq2lU8Pe8NGvgh5g5v9tLt1y7qFqgrCzEYL02SO/y 8gVx87wKdpxXRdyNfABeGcI4Hbl4NTs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-162-8kB39vAsMAeDCf3R6wktFg-1; Mon, 07 Sep 2020 13:44:29 -0400 X-MC-Unique: 8kB39vAsMAeDCf3R6wktFg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0636A10054FF; Mon, 7 Sep 2020 17:44:27 +0000 (UTC) Received: from redhat.com (ovpn-112-64.phx2.redhat.com [10.3.112.64]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 93DD25C230; Mon, 7 Sep 2020 17:44:23 +0000 (UTC) Received: from [127.0.0.1] (helo=vm-rhel7) by redhat.com with esmtp (Exim 4.94) (envelope-from ) id 1kFLBj-000064-R6; Mon, 07 Sep 2020 13:44:19 -0400 From: fche@redhat.com (Frank Ch. Eigler) To: Masami Hiramatsu Cc: peterz@infradead.org, Ingo Molnar , linux-kernel@vger.kernel.org, Eddy_Wu@trendmicro.com, x86@kernel.org, davem@davemloft.net, rostedt@goodmis.org, naveen.n.rao@linux.ibm.com, anil.s.keshavamurthy@intel.com, linux-arch@vger.kernel.org, cameron@moodycamel.com, oleg@redhat.com, will@kernel.org, paulmck@kernel.org, systemtap@sourceware.org Subject: Re: [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless References: <159870598914.1229682.15230803449082078353.stgit@devnote2> <20200901190808.GK29142@worktop.programming.kicks-ass.net> <20200902093739.8bd13603380951eaddbcd8a5@kernel.org> <20200902070226.GG2674@hirez.programming.kicks-ass.net> <20200902171755.b126672093a3c5d1b3a62a4f@kernel.org> <20200902093613.GY1362448@hirez.programming.kicks-ass.net> <20200902221926.f5cae5b4ad00b8d8f9ad99c7@kernel.org> <20200902134252.GH1362448@hirez.programming.kicks-ass.net> <20200903103954.68f0c97da57b3679169ce3a7@kernel.org> <20200903110226.8963179e6a7c978e2d56c595@kernel.org> Date: Mon, 07 Sep 2020 13:44:19 -0400 In-Reply-To: <20200903110226.8963179e6a7c978e2d56c595@kernel.org> (Masami Hiramatsu's message of "Thu, 3 Sep 2020 11:02:26 +0900") Message-ID: <87eendo51o.fsf@redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: linux-arch-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org Masami Hiramatsu writes: > Sorry, for noticing this point, I Cc'd to systemtap. Is systemtap taking > care of spinlock too? On PRREMPT_RT configurations, systemtap uses the raw_spinlock_t types/functions, to keep its probe handlers as atomic as we can make them. - FChE