> @@ -1448,7 +1451,8 @@ static int parse_cgroupfs_options(char *data, struct 
> cgroup_sb_opts *opts)
>               }
>  
>               for_each_subsys(ss, i) {
> -                     if (strcmp(token, ss->name))
> +                     if (strcmp(token, ss->name) &&
> +                         strcmp(token, ss->legacy_name))
>                               continue;

As mounting with specified subsystems is only allowed in legacy hierarchy,
I think we should allow using leagcy name only?

>                       if (ss->disabled)
>                               continue;

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