selftests/bpf: Make sure mount directory exists

The mount directory for the selftests cgroup tree might
not exist so let's make sure it does exist by creating
it ourselves if it doesn't exist.

Signed-off-by: Daan De Meyer <daan.j.demeyer@gmail.com>
Link: https://lore.kernel.org/r/20231011185113.140426-9-daan.j.demeyer@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

diff --git a/tools/testing/selftests/bpf/cgroup_helpers.c b/tools/testing/selftests/bpf/cgroup_helpers.c
index 24ba56d42f2dd88d9b9984cc053e2dcc884acd8e..5b1da2a32ea72b1b67f4af8d5ede9043c1510917 100644 (file)
--- a/tools/testing/selftests/bpf/cgroup_helpers.c
+++ b/tools/testing/selftests/bpf/cgroup_helpers.c
@@ -199,6 +199,11 @@ int setup_cgroup_environment(void)
 
        format_cgroup_path(cgroup_workdir, "");
 
+       if (mkdir(CGROUP_MOUNT_PATH, 0777) && errno != EEXIST) {
+               log_err("mkdir mount");
+               return 1;
+       }
+
        if (unshare(CLONE_NEWNS)) {
                log_err("unshare");
                return 1;