linux-kernel - [FIX PATCH v2] selftests: tracing: Fix to unmount tracefs for recovering environment

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Message-Id: <169448103881.242465.4589561134225171701.stgit@devnote2>
Date:   Tue, 12 Sep 2023 10:10:39 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: [FIX PATCH v2] selftests: tracing: Fix to unmount tracefs for recovering environment

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Fix to unmount the tracefs if the ftracetest mounted it for recovering
system environment. If the tracefs is already mounted, this does nothing.

Suggested-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/all/29fce076-746c-4650-8358-b4e0fa215cf7@sirena.org.uk/
Fixes: cbd965bde74c ("ftrace/selftests: Return the skip code when tracing directory not configured in kernel")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 Changes in v2:
   - use -n option explictly for testing the string is non-zero.
---
 tools/testing/selftests/ftrace/ftracetest |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index cb5f18c06593..d68264a5f3f0 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -31,6 +31,9 @@ err_ret=1
 # kselftest skip code is 4
 err_skip=4
 
+# umount required
+UMOUNT_DIR=""
+
 # cgroup RT scheduling prevents chrt commands from succeeding, which
 # induces failures in test wakeup tests.  Disable for the duration of
 # the tests.
@@ -45,6 +48,9 @@ setup() {
 
 cleanup() {
   echo $sched_rt_runtime_orig > $sched_rt_runtime
+  if [ -n "${UMOUNT_DIR}" ]; then
+    umount ${UMOUNT_DIR} ||:
+  fi
 }
 
 errexit() { # message
@@ -160,11 +166,13 @@ if [ -z "$TRACING_DIR" ]; then
 	    mount -t tracefs nodev /sys/kernel/tracing ||
 	      errexit "Failed to mount /sys/kernel/tracing"
 	    TRACING_DIR="/sys/kernel/tracing"
+	    UMOUNT_DIR=${TRACING_DIR}
 	# 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"
+	    UMOUNT_DIR=${TRACING_DIR}
 	else
 	    err_ret=$err_skip
 	    errexit "debugfs and tracefs are not configured in this kernel"