selftests/ftrace: Fix to use remount when testing mount GID option

JIRA: https://issues.redhat.com/browse/RHEL-86682

commit 159ca65
Author: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Date:   Tue Jan 7 21:11:07 2025 +0900

    selftests/ftrace: Fix to use remount when testing mount GID option

    Fix mount_options.tc to use remount option to mount the tracefs.
    Since the current implementation does not umount the tracefs,
    this test always fails because of -EBUSY error.
    Using remount option will allow us to change the mount option.

    Link: https://lore.kernel.org/r/173625186741.1383744.16707876180798573039.stgit@devnote2
    Fixes: 8b55572 ("tracing/selftests: Add tracefs mount options test")
    Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
    Cc: stable@vger.kernel.org
    Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>

Author: jeromemarchand

tools/testing/selftests/ftrace/test.d/00basic/mount_options.tc

@@ -15,11 +15,11 @@ find_alternate_gid() {
 	tac /etc/group | grep -v ":$original_gid:" | head -1 | cut -d: -f3
 }
 
-mount_tracefs_with_options() {
+remount_tracefs_with_options() {
 	local mount_point="$1"
 	local options="$2"
 
-	mount -t tracefs -o "$options" nodev "$mount_point"
+	mount -t tracefs -o "remount,$options" nodev "$mount_point"
 
 	setup
 }
@@ -81,7 +81,7 @@ test_gid_mount_option() {
 
 	# Unmount existing tracefs instance and mount with new GID
 	unmount_tracefs "$mount_point"
-	mount_tracefs_with_options "$mount_point" "$new_options"
+	remount_tracefs_with_options "$mount_point" "$new_options"
 
 	check_gid "$mount_point" "$other_group"
 
@@ -92,7 +92,7 @@ test_gid_mount_option() {
 
 	# Unmount and remount with the original GID
 	unmount_tracefs "$mount_point"
-	mount_tracefs_with_options "$mount_point" "$mount_options"
+	remount_tracefs_with_options "$mount_point" "$mount_options"
 	check_gid "$mount_point" "$original_group"
 }