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=-10.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT 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 A7BC2ECDE44 for ; Mon, 5 Nov 2018 09:01:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6EAA920819 for ; Mon, 5 Nov 2018 09:01:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="pcC5X0mT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6EAA920819 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728873AbeKESUP (ORCPT ); Mon, 5 Nov 2018 13:20:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:50022 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726228AbeKESUO (ORCPT ); Mon, 5 Nov 2018 13:20:14 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (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 0856D20819; Mon, 5 Nov 2018 09:01:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541408494; bh=kvPU1QGPViKM90GlxOmNOjqH2CIuDPpvSXHvhno4gt8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pcC5X0mTR3UXjGhvkbeVflkG5lIvYyUS1rk48RSvMKmqKA2pduEyhaaZ9jzPCdM71 9JYozltPxQdHFCVZdy6Mh0L8Xy+cWaT6x6Nz9VCeDuzw4q/8XqBP18QL6hzSVN7jhs 8P+t7i9hMDOFxhWl1D3/kNl35povp60HJzB8duns= From: Masami Hiramatsu To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Tom Zanussi , Ravi Bangoria Subject: [PATCH v2 03/12] tracing: Simplify creation and deletion of synthetic event Date: Mon, 5 Nov 2018 18:01:12 +0900 Message-Id: <154140847194.17322.17960275728005067803.stgit@devbox> X-Mailer: git-send-email 2.13.6 In-Reply-To: <154140838606.17322.15294184388075458777.stgit@devbox> References: <154140838606.17322.15294184388075458777.stgit@devbox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Simplify creation and deletion code of synthetic event. Since the event_mutex and synth_event_mutex ordering issue is gone, we can skip existing event check when adding or deleting event, and some redundant code in error path. This changes release_all_synth_events() to abort the process when it hits any error and returns the error code. It succeeds only if it has no error. Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_events_hist.c | 53 +++++++++++++------------------------- 1 file changed, 18 insertions(+), 35 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 1670c65389fe..0feb7f460123 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1008,18 +1008,6 @@ struct hist_var_data { struct hist_trigger_data *hist_data; }; -static void add_or_delete_synth_event(struct synth_event *event, int delete) -{ - if (delete) - free_synth_event(event); - else { - if (!find_synth_event(event->name)) - list_add(&event->list, &synth_event_list); - else - free_synth_event(event); - } -} - static int create_synth_event(int argc, char **argv) { struct synth_field *field, *fields[SYNTH_FIELDS_MAX]; @@ -1052,15 +1040,16 @@ static int create_synth_event(int argc, char **argv) if (event) { if (delete_event) { if (event->ref) { - event = NULL; ret = -EBUSY; goto out; } - list_del(&event->list); - goto out; - } - event = NULL; - ret = -EEXIST; + ret = unregister_synth_event(event); + if (!ret) { + list_del(&event->list); + free_synth_event(event); + } + } else + ret = -EEXIST; goto out; } else if (delete_event) { ret = -ENOENT; @@ -1100,29 +1089,21 @@ static int create_synth_event(int argc, char **argv) event = NULL; goto err; } + ret = register_synth_event(event); + if (!ret) + list_add(&event->list, &synth_event_list); + else + free_synth_event(event); out: - if (event) { - if (delete_event) { - ret = unregister_synth_event(event); - add_or_delete_synth_event(event, !ret); - } else { - ret = register_synth_event(event); - add_or_delete_synth_event(event, ret); - } - } mutex_unlock(&synth_event_mutex); mutex_unlock(&event_mutex); return ret; err: - mutex_unlock(&synth_event_mutex); - mutex_unlock(&event_mutex); - for (i = 0; i < n_fields; i++) free_synth_field(fields[i]); - free_synth_event(event); - return ret; + goto out; } static int release_all_synth_events(void) @@ -1141,10 +1122,12 @@ static int release_all_synth_events(void) } list_for_each_entry_safe(event, e, &synth_event_list, list) { - list_del(&event->list); - ret = unregister_synth_event(event); - add_or_delete_synth_event(event, !ret); + if (!ret) { + list_del(&event->list); + free_synth_event(event); + } else + break; } mutex_unlock(&synth_event_mutex); mutex_unlock(&event_mutex);