linux-kernel - [PATCH] perf: Use a define for the maximum length of a trace event

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Date:	Sat, 19 Sep 2009 13:36:30 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	mingo@...e.hu
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	peterz@...radead.org, Paul Mackerras <paulus@...ba.org>
Subject: [PATCH] perf: Use a define for the maximum length of a trace event

 From e5f5037ae4423c188aa68ee6ba239708bb720722 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@...ux.intel.com>
Date: Sat, 19 Sep 2009 13:21:20 +0200
Subject: [PATCH] perf: Use a define for the maximum length of a trace event

As per Ingo's review: use a #define rather than an open coded constant
for the maximum length of a trace event for storing in the perf.data file.

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 tools/perf/util/header.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ef91145..ed6b553 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -86,9 +86,10 @@ void perf_header__add_attr(struct perf_header *self,
 	self->attr[pos] = attr;
 }
 
+#define MAX_EVENT_NAME 64
 struct perf_trace_event_type {
 	u64	event_id;
-	char	name[64];
+	char	name[MAX_EVENT_NAME];
 };
 
 static int event_count;
@@ -96,7 +97,7 @@ static struct perf_trace_event_type *events;
 
 void perf_header__push_event(u64 id, const char *name)
 {
-	if (strlen(name) > 64)
+	if (strlen(name) > MAX_EVENT_NAME)
 		printf("Event %s will be truncated\n", name);
 
 	if (!events) {
@@ -110,7 +111,7 @@ void perf_header__push_event(u64 id, const char *name)
 	}
 	memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
 	events[event_count].event_id = id;
-	strncpy(events[event_count].name, name, 63);
+	strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
 	event_count++;
 }
 
-- 
1.6.0.6




-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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