> @@ -3085,8 +3091,37 @@ static int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
> return ret;
> }
>
> +/**
> + * cgroup_add_dfl_cftypes - add an array of cftypes for default hierarchy
> + * @ss: target cgroup subsystem
> + * @cfts: zero-length name terminated array of cftypes
> + *
> + * Similar to cgroup_add_cftypes() but the added files are only used for
> + * the default hierarchy.
> + */
> +int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
> +{
> + struct cftype *cft;
> +
> + for (cft = cfts; cft && cft->name[0] != '\0'; cft++)
> + cft->flags |= CFTYPE_ONLY_ON_DFL;
I think we should remove this flag in cgroup_rm_cftypes_locked(). Otherwise
if we call cgroup_add_dlf_cftypes() and then cgroup_rm_cftypes() and then
cgroup_add_legacy_cftypes() for the same @cfts, both CFTYPE_ONLY_ON_DFL and
CFTYPE_INSANE are set.
> + return cgroup_add_cftypes(ss, cfts);
> +}
> +
> +/**
> + * cgroup_add_legacy_cftypes - add an array of cftypes for legacy hierarchies
> + * @ss: target cgroup subsystem
> + * @cfts: zero-length name terminated array of cftypes
> + *
> + * Similar to cgroup_add_cftypes() but the added files are only used for
> + * the legacy hierarchies.
> + */
> int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
> {
> + struct cftype *cft;
> +
> + for (cft = cfts; cft && cft->name[0] != '\0'; cft++)
> + cft->flags |= CFTYPE_INSANE;
> return cgroup_add_cftypes(ss, cfts);
> }
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