root_reclaim
if (current->reclaim_state && root_reclaim(sc)) {
if (!root_reclaim(sc))
VM_WARN_ON_ONCE(root_reclaim(sc));
VM_WARN_ON_ONCE(!root_reclaim(sc));
if (lru_gen_enabled() && !root_reclaim(sc)) {
if (lru_gen_enabled() && root_reclaim(sc)) {