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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 9417CC352A5 for ; Mon, 10 Feb 2020 13:31:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6CDE520715 for ; Mon, 10 Feb 2020 13:31:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581341497; bh=X1/CGyWzE6LZ7SEvDWQ3CJRkzMG23FuCRVcyoEi87Nk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DJ5/xnDcrlMQVMzgIctW28NbaGRV97rpva625PxeTV+rKlHWVrTMt7HOxTwzXZFQz G4GzUPi6PwYyaLpxMGOyEW0kK2HSzPZbm2C6DNzlMiL4T46w5trtaY0XR9eWZgkjt8 D6CnHEZf+NpvywJEIRYd5QhZ2Xj8LtOq+KJ49vcM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728099AbgBJNb3 (ORCPT ); Mon, 10 Feb 2020 08:31:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:54184 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728212AbgBJMgB (ORCPT ); Mon, 10 Feb 2020 07:36:01 -0500 Received: from localhost (unknown [209.37.97.194]) (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 60E202085B; Mon, 10 Feb 2020 12:36:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581338160; bh=X1/CGyWzE6LZ7SEvDWQ3CJRkzMG23FuCRVcyoEi87Nk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vhaPgB3W5IVzEX+iZ4roQqt1+Bb5s3mfQxVMj5cJ0K/BBu0cGpmJFiZEEzmKOPLc8 SUG78tSHYBi62LNQZ2yIriYykC2vH4opFWxR/vcqn+6plBiylCnPOvyQpw6URabOp/ 91W/KnIVGcsj9X37NgKHhhUhRm/IQ4q50S7BRdaI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Joel Fernandes (Google)" , Amol Grover , "Steven Rostedt (VMware)" , Sasha Levin Subject: [PATCH 4.19 092/195] tracing: Annotate ftrace_graph_hash pointer with __rcu Date: Mon, 10 Feb 2020 04:32:30 -0800 Message-Id: <20200210122314.290461607@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200210122305.731206734@linuxfoundation.org> References: <20200210122305.731206734@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Amol Grover [ Upstream commit 24a9729f831462b1d9d61dc85ecc91c59037243f ] Fix following instances of sparse error kernel/trace/ftrace.c:5664:29: error: incompatible types in comparison kernel/trace/ftrace.c:5785:21: error: incompatible types in comparison kernel/trace/ftrace.c:5864:36: error: incompatible types in comparison kernel/trace/ftrace.c:5866:25: error: incompatible types in comparison Use rcu_dereference_protected to access the __rcu annotated pointer. Link: http://lkml.kernel.org/r/20200201072703.17330-1-frextrite@gmail.com Reviewed-by: Joel Fernandes (Google) Signed-off-by: Amol Grover Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Sasha Levin --- kernel/trace/ftrace.c | 2 +- kernel/trace/trace.h | 9 ++++++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 37a435bac1618..00d987d9bd4a6 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -5072,7 +5072,7 @@ static const struct file_operations ftrace_notrace_fops = { static DEFINE_MUTEX(graph_lock); -struct ftrace_hash *ftrace_graph_hash = EMPTY_HASH; +struct ftrace_hash __rcu *ftrace_graph_hash = EMPTY_HASH; struct ftrace_hash *ftrace_graph_notrace_hash = EMPTY_HASH; enum graph_filter_type { diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index d11d7bfc3fa5c..70806f2f89bab 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -872,22 +872,25 @@ extern void __trace_graph_return(struct trace_array *tr, unsigned long flags, int pc); #ifdef CONFIG_DYNAMIC_FTRACE -extern struct ftrace_hash *ftrace_graph_hash; +extern struct ftrace_hash __rcu *ftrace_graph_hash; extern struct ftrace_hash *ftrace_graph_notrace_hash; static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) { unsigned long addr = trace->func; int ret = 0; + struct ftrace_hash *hash; preempt_disable_notrace(); - if (ftrace_hash_empty(ftrace_graph_hash)) { + hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); + + if (ftrace_hash_empty(hash)) { ret = 1; goto out; } - if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { + if (ftrace_lookup_ip(hash, addr)) { /* * This needs to be cleared on the return functions -- 2.20.1