selftests/resctrl: Refactor remount_resctrl(bool mum_resctrlfs) to mount_resctrl()

Mount/umount of the resctrl FS is now paired nicely per test.

Rename remount_resctrl(bool mum_resctrlfs) to mount_resctrl(). Make
it unconditionally try to mount the resctrl FS and return error if
resctrl FS was mounted already.

While at it, group the mount/umount prototypes in the header.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan (Fujitsu) <tan.shaopeng@fujitsu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

1 files changed, 7 insertions, 16 deletions

diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index edc3f92b11b1..c45666942439 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -48,29 +48,20 @@ static int find_resctrl_mount(char *buffer)
 }
 
 /*
- * remount_resctrlfs - Remount resctrl FS at /sys/fs/resctrl
- * @mum_resctrlfs:	Should the resctrl FS be remounted?
+ * mount_resctrlfs - Mount resctrl FS at /sys/fs/resctrl
  *
- * If not mounted, mount it.
- * If mounted and mum_resctrlfs then remount resctrl FS.
- * If mounted and !mum_resctrlfs then noop
+ * Mounts resctrl FS. Fails if resctrl FS is already mounted to avoid
+ * pre-existing settings interfering with the test results.
  *
  * Return: 0 on success, non-zero on failure
  */
-int remount_resctrlfs(bool mum_resctrlfs)
+int mount_resctrlfs(void)
 {
-	char mountpoint[256];
 	int ret;
 
-	ret = find_resctrl_mount(mountpoint);
-	if (ret)
-		strcpy(mountpoint, RESCTRL_PATH);
-
-	if (!ret && mum_resctrlfs && umount(mountpoint))
-		ksft_print_msg("Fail: unmounting \"%s\"\n", mountpoint);
-
-	if (!ret && !mum_resctrlfs)
-		return 0;
+	ret = find_resctrl_mount(NULL);
+	if (ret != -ENOENT)
+		return -1;
 
 	ksft_print_msg("Mounting resctrl to \"%s\"\n", RESCTRL_PATH);
 	ret = mount("resctrl", RESCTRL_PATH, "resctrl", 0, NULL);