linux-kernel - [PATCH 2/3] perf trace: cleanup find

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Date:	Mon, 28 Dec 2009 16:48:30 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>
Subject: [PATCH 2/3] perf trace: cleanup find_debugfs()

Remove redundant code for 'perf trace'

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 tools/perf/util/debugfs.c          |    1 +
 tools/perf/util/trace-event-info.c |   29 +++++------------------------
 2 files changed, 6 insertions(+), 24 deletions(-)

diff --git a/tools/perf/util/debugfs.c b/tools/perf/util/debugfs.c
index 1f805fd..a88fefc 100644
--- a/tools/perf/util/debugfs.c
+++ b/tools/perf/util/debugfs.c
@@ -130,6 +130,7 @@ char *debugfs_mount(const char *mountpoint)
 
 	/* save the mountpoint */
 	strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
+	debugfs_found = 1;
 
 	return debugfs_mountpoint;
 }
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index cace355..5dd5c81 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -37,6 +37,7 @@
 
 #include "../perf.h"
 #include "trace-event.h"
+#include "debugfs.h"
 
 #define VERSION "0.5"
 
@@ -101,32 +102,12 @@ void *malloc_or_die(unsigned int size)
 
 static const char *find_debugfs(void)
 {
-	static char debugfs[MAX_PATH+1];
-	static int debugfs_found;
-	char type[100];
-	FILE *fp;
-
-	if (debugfs_found)
-		return debugfs;
-
-	if ((fp = fopen("/proc/mounts","r")) == NULL)
-		die("Can't open /proc/mounts for read");
-
-	while (fscanf(fp, "%*s %"
-		      STR(MAX_PATH)
-		      "s %99s %*s %*d %*d\n",
-		      debugfs, type) == 2) {
-		if (strcmp(type, "debugfs") == 0)
-			break;
-	}
-	fclose(fp);
-
-	if (strcmp(type, "debugfs") != 0)
-		die("debugfs not mounted, please mount");
+	const char *path = debugfs_mount(NULL);
 
-	debugfs_found = 1;
+	if (!path)
+		die("Your kernel not support debugfs filesystem");
 
-	return debugfs;
+	return path;
 }
 
 /*
-- 
1.6.1.2


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