On Sat, 9 Sep 2023 18:36:39 +0900 "Masami Hiramatsu (Google)" <mhira...@kernel.org> wrote:
> From: Masami Hiramatsu (Google) <mhira...@kernel.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 <broo...@kernel.org> > Link: > https://lore.kernel.org/all/29fce076-746c-4650-8358-b4e0fa215...@sirena.org.uk/ > Fixes: cbd965bde74c ("ftrace/selftests: Return the skip code when tracing > directory not configured in kernel") > Signed-off-by: Masami Hiramatsu (Google) <mhira...@kernel.org> > --- > 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..89c212d82256 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 > $sched_rt_runtime > + if [ "${UMOUNT_DIR}" ]; then Shouldn't the above be: if [ ! -z "${UNMOUNT_DIR}" ]; then ? -- Steve > + 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"
