> +void vmpressure_pin_memcg(struct vmpressure *vmpr)
> +{
> + struct mem_cgroup *memcg = vmpressure_to_mem_cgroup(vmpr);
> + if (memcg != root_mem_cgroup)
this check is redundant. see the definition of css_get():
static inline void css_get(struct cgroup_subsys_state *css)
{
/* We don't need to reference count the root state */
if (!(css->flags & CSS_ROOT))
__css_get(css, 1);
}
> + css_get(&memcg->css);
> +}
> +
> +void vmpressure_unpin_memcg(struct vmpressure *vmpr)
> +{
> + struct mem_cgroup *memcg = vmpressure_to_mem_cgroup(vmpr);
> + if (memcg != root_mem_cgroup)
ditto
> + css_put(&memcg->css);
> +}
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