check_resctrlfs_support() does the following
1. Checks if the platform supports resctrl file system or not by looking
for resctrl in /proc/filesystems
2. Calls opendir() on default resctrl file system path
(i.e. /sys/fs/resctrl)
3. Checks if resctrl file system is mounted or not by looking at
/proc/mounts
Steps 2 and 3 will fail if the platform does not support resctrl file
system. So, there is no need to check for them if step 1 fails.
Fix this by returning immediately if the platform does not support
resctrl file system.
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
---
tools/testing/selftests/resctrl/resctrlfs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index e3d18e113313..10b9292f33e5 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -570,6 +570,9 @@ bool check_resctrlfs_support(void)
ksft_print_msg("%s kernel supports resctrl filesystem\n",
ret ? "pass:" : "fail:");
+ if (!ret)
+ return ret;
+
dp = opendir(RESCTRL_PATH);
ksft_print_msg("%s resctrl mountpoint \"%s\" exists\n",
dp ? "pass:" : "fail:", RESCTRL_PATH);
--
2.30.1
