linux-kernel - [PATCH 1/2] kselftests/ftrace: Detect tracefs mount point

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Date:	Tue, 10 May 2016 23:53:05 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Shuah Khan <shuahkh@....samsung.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 1/2] kselftests/ftrace: Detect tracefs mount point

Currently ftracetest assumes tracing directory is located under
$DEBUGFS/tracing.  But it's possible to mount tracefs directly without
debugfs.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/testing/selftests/ftrace/ftracetest | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index da48812ab95e..4c6a0bf8ba79 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -88,7 +88,12 @@ parse_opts() { # opts
 
 # Parameters
 DEBUGFS_DIR=`grep debugfs /proc/mounts | cut -f2 -d' ' | head -1`
-TRACING_DIR=$DEBUGFS_DIR/tracing
+if [ -z "$DEBUGFS_DIR" ]; then
+    TRACING_DIR=`grep tracefs /proc/mounts | cut -f2 -d' ' | head -1`
+else
+    TRACING_DIR=$DEBUGFS_DIR/tracing
+fi
+
 TOP_DIR=`absdir $0`
 TEST_DIR=$TOP_DIR/test.d
 TEST_CASES=`find_testcases $TEST_DIR`
@@ -102,7 +107,7 @@ parse_opts $*
 [ $DEBUG -ne 0 ] && set -x
 
 # Verify parameters
-if [ -z "$DEBUGFS_DIR" -o ! -d "$TRACING_DIR" ]; then
+if [ -z "$TRACING_DIR" -o ! -d "$TRACING_DIR" ]; then
   errexit "No ftrace directory found"
 fi
 
-- 
2.8.0