linux-kernel - [PATCH 07/20] tracing/filter: Simplify tracepoint event lookup

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Date:	Mon, 10 Oct 2011 09:38:59 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 07/20] tracing/filter: Simplify tracepoint event lookup

From: Jiri Olsa <jolsa@...hat.com>

We dont need to perform lookup through the ftrace_events list,
instead we can use the 'tp_event' field.

Each perf_event contains tracepoint event field 'tp_event', which
got initialized during the tracepoint event initialization.

Signed-off-by: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-5-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace_events_filter.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 97b93f3..0948905 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1894,17 +1894,14 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
 	int err;
 	struct event_filter *filter;
 	struct filter_parse_state *ps;
-	struct ftrace_event_call *call = NULL;
+	struct ftrace_event_call *call;
 
 	mutex_lock(&event_mutex);
 
-	list_for_each_entry(call, &ftrace_events, list) {
-		if (call->event.type == event_id)
-			break;
-	}
+	call = event->tp_event;
 
 	err = -EINVAL;
-	if (&call->list == &ftrace_events)
+	if (!call)
 		goto out_unlock;
 
 	err = -EEXIST;
-- 
1.7.6.3



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