Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752986AbdLFWkc (ORCPT ); Wed, 6 Dec 2017 17:40:32 -0500 Received: from mga07.intel.com ([134.134.136.100]:42414 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752952AbdLFWk2 (ORCPT ); Wed, 6 Dec 2017 17:40:28 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,369,1508828400"; d="scan'208";a="16076666" From: Tom Zanussi To: rostedt@goodmis.org Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org, vedang.patel@intel.com, bigeasy@linutronix.de, joel.opensrc@gmail.com, joelaf@google.com, mathieu.desnoyers@efficios.com, baohong.liu@intel.com, rajvi.jingar@intel.com, julia@ni.com, fengguang.wu@intel.com, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Tom Zanussi Subject: [PATCH v7 28/37] tracing: Allow whitespace to surround hist trigger filter Date: Wed, 6 Dec 2017 16:38:09 -0600 Message-Id: X-Mailer: git-send-email 1.9.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1929 Lines: 69 The existing code only allows for one space before and after the 'if' specifying the filter for a hist trigger. Add code to make that more permissive as far as whitespace goes. Specifically, we want to allow spaces in the trigger itself now that we have additional syntax (onmatch/onmax) where spaces are more natural e.g. spaces after commas in param lists. Signed-off-by: Tom Zanussi --- kernel/trace/trace_events_hist.c | 37 ++++++++++++++++++++++++++++++++----- 1 file changed, 32 insertions(+), 5 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 03114fb..672992f 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -5175,7 +5175,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops, struct synth_event *se; const char *se_name; bool remove = false; - char *trigger; + char *trigger, *p; int ret = 0; if (!param) @@ -5184,10 +5184,37 @@ static int event_hist_trigger_func(struct event_command *cmd_ops, if (glob[0] == '!') remove = true; - /* separate the trigger from the filter (k:v [if filter]) */ - trigger = strsep(¶m, " \t"); - if (!trigger) - return -EINVAL; + /* + * separate the trigger from the filter (k:v [if filter]) + * allowing for whitespace in the trigger + */ + p = trigger = param; + do { + p = strstr(p, "if"); + if (!p) + break; + if (p == param) + return -EINVAL; + if (*(p - 1) != ' ' && *(p - 1) != '\t') { + p++; + continue; + } + if (p >= param + strlen(param) - strlen("if") - 1) + return -EINVAL; + if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') { + p++; + continue; + } + break; + } while (p); + + if (!p) + param = NULL; + else { + *(p - 1) = '\0'; + param = strstrip(p); + trigger = strstrip(trigger); + } attrs = parse_hist_trigger_attrs(trigger); if (IS_ERR(attrs)) -- 1.9.3