From patchwork Tue Feb 2 19:54:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 12062825 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=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 71E8EC433DB for ; Tue, 2 Feb 2021 20:01:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B25364E43 for ; Tue, 2 Feb 2021 20:01:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240232AbhBBUBc (ORCPT ); Tue, 2 Feb 2021 15:01:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:58540 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240307AbhBBUAx (ORCPT ); Tue, 2 Feb 2021 15:00:53 -0500 Received: from gandalf.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 15A7464E2C for ; Tue, 2 Feb 2021 20:00:12 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.94) (envelope-from ) id 1l71qN-0095ZO-0Y for linux-trace-devel@vger.kernel.org; Tue, 02 Feb 2021 15:00:11 -0500 Message-ID: <20210202200010.887769022@goodmis.org> User-Agent: quilt/0.66 Date: Tue, 02 Feb 2021 14:54:59 -0500 From: Steven Rostedt To: linux-trace-devel@vger.kernel.org Subject: [PATCH 1/2] tracefs: Use new BUILD_BUG_ON() and ARRAY_SIZE() macros for options_map intergity References: <20210202195458.176697224@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org From: "Steven Rostedt (VMware)" Instead of having the options_map use TRACEFS_OPTIONS_MAX as its index, have the array extend by the elements, and use the new macros BUILD_BUG_ON() and ARRAY_SIZE() to make sure that the array always is the same size as the TRACEFS_OPTIONS_MAX. No functional changes. Signed-off-by: Steven Rostedt (VMware) --- include/tracefs-local.h | 6 ++++++ src/tracefs-tools.c | 5 ++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/tracefs-local.h b/include/tracefs-local.h index 3a7ec32a8853..187870e7c491 100644 --- a/include/tracefs-local.h +++ b/include/tracefs-local.h @@ -8,6 +8,12 @@ #define __hidden __attribute__((visibility ("hidden"))) +#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0])) + +/* Will cause a division by zero warning if cond is true */ +#define BUILD_BUG_ON(cond) \ + do { if (!(1/!(cond))) { } } while (0) + /* Can be overridden */ void warning(const char *fmt, ...); diff --git a/src/tracefs-tools.c b/src/tracefs-tools.c index 6e7fce53cef1..7f69cde93115 100644 --- a/src/tracefs-tools.c +++ b/src/tracefs-tools.c @@ -19,7 +19,7 @@ #define TRACE_CTRL "tracing_on" -static const char * const options_map[TRACEFS_OPTION_MAX] = { +static const char * const options_map[] = { "unknown", "annotate", "bin", "blk_cgname", "blk_cgroup", "blk_classic", "block", "context-info", "disable_on_free", "display-graph", "event-fork", "funcgraph-abstime", "funcgraph-cpu", "funcgraph-duration", "funcgraph-irqs", @@ -132,6 +132,9 @@ int tracefs_trace_off_fd(int fd) */ const char *tracefs_option_name(enum tracefs_option_id id) { + /* Make sure options map contains all the options */ + BUILD_BUG_ON(ARRAY_SIZE(options_map) != TRACEFS_OPTION_MAX); + if (id < TRACEFS_OPTION_MAX) return options_map[id];