Resctrl FS mount/remount/umount code is hard to track. Better approach is to use mount/umount pair for each test but that assumes resctrl FS is not mounted beforehand.
Change umount_resctrlfs() so that it can unmount resctrl FS from any path, and enable further simplifications into mount/remount/umount logic by unmounting resctrl FS at the start if a pre-existing mountpoint is found.
Suggested-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com --- tools/testing/selftests/resctrl/resctrl_tests.c | 2 ++ tools/testing/selftests/resctrl/resctrlfs.c | 6 ++++-- 2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index 9b9751206e1c..b1b2d28b52f7 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -250,6 +250,8 @@ int main(int argc, char **argv) if (!check_resctrlfs_support()) return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n");
+ umount_resctrlfs(); + filter_dmesg();
ksft_set_plan(tests ? : 4); diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index fb00245dee92..23f75aeaa198 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -82,10 +82,12 @@ int remount_resctrlfs(bool mum_resctrlfs)
int umount_resctrlfs(void) { - if (find_resctrl_mount(NULL)) + char mountpoint[256]; + + if (find_resctrl_mount(mountpoint)) return 0;
- if (umount(RESCTRL_PATH)) { + if (umount(mountpoint)) { perror("# Unable to umount resctrl");
return errno;