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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 A8308C2D0BF for ; Wed, 18 Dec 2019 15:28:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 783A9206CB for ; Wed, 18 Dec 2019 15:28:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576682905; bh=A0iRuyj+upvJMXwpRg073V0hw6eSYTg1rP/I8UILdfY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:List-ID:From; b=0QHC82NIYraOj6OT0WZhw7hL/N6Ie9E4jHe+20P1rxaJhov4Y1xGVd7BIUYWTOzDS iX2GVtc0sWemQMPUSubWYMnffdGvpaAANdL8ESMII2VUoU72VWSztDNzZuhiqzAYMj RA6wqmHgOS3h+v8CPYMO4nd2Z4+/Z9AZWnPcDyyA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727231AbfLRP14 (ORCPT ); Wed, 18 Dec 2019 10:27:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:59954 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727215AbfLRP1z (ORCPT ); Wed, 18 Dec 2019 10:27:55 -0500 Received: from tzanussi-mobl.hsd1.il.comcast.net (c-98-220-238-81.hsd1.il.comcast.net [98.220.238.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B5FA82465E; Wed, 18 Dec 2019 15:27:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576682874; bh=A0iRuyj+upvJMXwpRg073V0hw6eSYTg1rP/I8UILdfY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=nTk6Vip/fNko8edIiO12vaCUpywza+JfJWITEfd6y0hf4Ej9P+rHV3DF+DITXow6h AE4AJDBmdw/aGqXSn+uHfJXR6uqnTbNF1ARb5JZOeVGjd2TttCWg4lbRBHZac+A3uG MzgiH+3BS1Zds+9m5LcEmtaWH2E78gt+VAdHc2RU= From: Tom Zanussi To: rostedt@goodmis.org Cc: artem.bityutskiy@linux.intel.com, mhiramat@kernel.org, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: [PATCH 3/7] tracing: Add delete_synth_event() Date: Wed, 18 Dec 2019 09:27:39 -0600 Message-Id: X-Mailer: git-send-email 2.14.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org create_or_delete_synth_event() contains code to delete a synthetic event, which would be useful on its own - specifically, it would be useful to allow event-creating modules to call it separately. Separate out the delete code from that function and create an exported function named delete_synth_event(). Signed-off-by: Tom Zanussi --- include/linux/trace_events.h | 2 ++ kernel/trace/trace_events_hist.c | 57 +++++++++++++++++++++++++++++----------- 2 files changed, 43 insertions(+), 16 deletions(-) diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index cf982c7d6636..0c36a58cea43 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -358,6 +358,8 @@ extern struct trace_event_file *get_event_file_nolock(const char *instance, extern void put_event_file(struct trace_event_file *file); extern void put_event_file_nolock(struct trace_event_file *file); +extern int delete_synth_event(const char *name); + /* * Event file flags: * ENABLED - The event is enabled diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index f49d1a36d3ae..8c9894681100 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1335,29 +1335,54 @@ static int __create_synth_event(int argc, const char *name, const char **argv) goto out; } +static int destroy_synth_event(struct synth_event *se) +{ + int ret; + + if (se->ref) + ret = -EBUSY; + else { + ret = unregister_synth_event(se); + if (!ret) { + dyn_event_remove(&se->devent); + free_synth_event(se); + } + } + + return ret; +} + +/** + * delete_synth_event - Delete a synthetic event + * @event_name: The name of the new sythetic event + * + * Delete a synthetic event that was created with create_synth_event(). + * + * Return: 0 if successful, error otherwise. + */ +int delete_synth_event(const char *event_name) +{ + struct synth_event *se = NULL; + int ret = -ENOENT; + + mutex_lock(&event_mutex); + se = find_synth_event(event_name); + if (se) + ret = destroy_synth_event(se); + mutex_unlock(&event_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(delete_synth_event); + static int create_or_delete_synth_event(int argc, char **argv) { const char *name = argv[0]; - struct synth_event *event = NULL; int ret; /* trace_run_command() ensures argc != 0 */ if (name[0] == '!') { - mutex_lock(&event_mutex); - event = find_synth_event(name + 1); - if (event) { - if (event->ref) - ret = -EBUSY; - else { - ret = unregister_synth_event(event); - if (!ret) { - dyn_event_remove(&event->devent); - free_synth_event(event); - } - } - } else - ret = -ENOENT; - mutex_unlock(&event_mutex); + ret = delete_synth_event(name + 1); return ret; } -- 2.14.1