Merge tag 'trace-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...

[sfrench/cifs-2.6.git] / tools / testing / selftests / ftrace / ftracetest

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 6d5e9e87c4b7f51f5904d17fa016a134563ba0d0..063ecb290a5a3442bb116639dbc7ac866c0f0639 100755 (executable)
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -23,9 +23,15 @@ echo "                           If <dir> is -, all logs output in console only"
 exit $1
 }
 
+# default error
+err_ret=1
+
+# kselftest skip code is 4
+err_skip=4
+
 errexit() { # message
   echo "Error: $1" 1>&2
-  exit 1
+  exit $err_ret
 }
 
 # Ensuring user privilege
@@ -116,11 +122,31 @@ parse_opts() { # opts
 }
 
 # Parameters
-DEBUGFS_DIR=`grep debugfs /proc/mounts | cut -f2 -d' ' | head -1`
-if [ -z "$DEBUGFS_DIR" ]; then
-    TRACING_DIR=`grep tracefs /proc/mounts | cut -f2 -d' ' | head -1`
-else
-    TRACING_DIR=$DEBUGFS_DIR/tracing
+TRACING_DIR=`grep tracefs /proc/mounts | cut -f2 -d' ' | head -1`
+if [ -z "$TRACING_DIR" ]; then
+    DEBUGFS_DIR=`grep debugfs /proc/mounts | cut -f2 -d' ' | head -1`
+    if [ -z "$DEBUGFS_DIR" ]; then
+       # If tracefs exists, then so does /sys/kernel/tracing
+       if [ -d "/sys/kernel/tracing" ]; then
+           mount -t tracefs nodev /sys/kernel/tracing ||
+             errexit "Failed to mount /sys/kernel/tracing"
+           TRACING_DIR="/sys/kernel/tracing"
+       # If debugfs exists, then so does /sys/kernel/debug
+       elif [ -d "/sys/kernel/debug" ]; then
+           mount -t debugfs nodev /sys/kernel/debug ||
+             errexit "Failed to mount /sys/kernel/debug"
+           TRACING_DIR="/sys/kernel/debug/tracing"
+       else
+           err_ret=$err_skip
+           errexit "debugfs and tracefs are not configured in this kernel"
+       fi
+    else
+       TRACING_DIR="$DEBUGFS_DIR/tracing"
+    fi
+fi
+if [ ! -d "$TRACING_DIR" ]; then
+    err_ret=$err_skip
+    errexit "ftrace is not configured in this kernel"
 fi
 
 TOP_DIR=`absdir $0`