[PATCH 5.15] net: defer final 'struct net' free in netns dismantle

We also need this patch for both 5.15 and 5.10. For 5.15 it seems this patch has not been accepted yet. Any reason for that? For 5.10 I saw the patch 41467d2ff4df("net: net_namespace: Optimize the code") as a prerequisite for 0f6ede9fbc74 ("net: defer final 'struct net' free in netns dismantle") is already in the 5.15-stable tree. Would the original patch be accepted in next release?