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=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 6EBFFC3B186 for ; Wed, 12 Feb 2020 09:44:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 36ACA20848 for ; Wed, 12 Feb 2020 09:44:13 +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="rFd2rAAJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729000AbgBLJns (ORCPT ); Wed, 12 Feb 2020 04:43:48 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:46608 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728978AbgBLJnp (ORCPT ); Wed, 12 Feb 2020 04:43:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-Id:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=qyYgZMuOWCAOWnIH7ZGLAqejtnVfskS/7yQ5JC3wMFY=; b=rFd2rAAJq42yjHLB9LjIsrZIti dl6xFyt0RvHOxZ7LBgxWgBCZ3OtZ/3JgBe8wGsW6ZsCSdRynnfEA6cqAis4cptBUuGHA8JyomOgLh 2GqGVsFSHqa/FBG9EP9IkOTzVe68Nkd8GXCY2k1TaooQu+kosWWZV9XXiMTMpiapef6N3U+E2XV8U o4vF8Xwl6jV7XnXi/F0txQ5JCRJGFdF3+tabjuSese8ta1YxDrKaK1/iu6G4r7m+Pb873jzyqD7xF I+8hU+E7uxAiXuHlTHct5BC3DgDdBjIEhjR5X3zuWqkt0H7LgD/qOmrLFFywZSRKSCXzc+RAMMaut pw414+MA==; 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-0006zV-98; 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 5B8BA307793; Wed, 12 Feb 2020 10:41:32 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 57FB22B9154F4; Wed, 12 Feb 2020 10:43:21 +0100 (CET) Message-Id: <20200212094107.838108888@infradead.org> User-Agent: quilt/0.65 Date: Wed, 12 Feb 2020 10:32:14 +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 4/8] sched,rcu,tracing: Mark preempt_count_{add,sub}() notrace References: <20200212093210.468391728@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Because of the requirement that no tracing happens until after we've incremented preempt_count, see nmi_enter() / trace_rcu_enter(), mark these functions as notrace. Signed-off-by: Peter Zijlstra (Intel) --- kernel/sched/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3781,7 +3781,7 @@ static inline void preempt_latency_start } } -void preempt_count_add(int val) +void notrace preempt_count_add(int val) { #ifdef CONFIG_DEBUG_PREEMPT /* @@ -3813,7 +3813,7 @@ static inline void preempt_latency_stop( trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip()); } -void preempt_count_sub(int val) +void notrace preempt_count_sub(int val) { #ifdef CONFIG_DEBUG_PREEMPT /*