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[ Upstream commit1135fad204] This patch enables the sysctl mtu_expires to be configured per net namespace. Signed-off-by: xu xin <xu.xin16@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of:139512191b("ipv4: use RCU protection in __ip_rt_update_pmtu()") Signed-off-by: Sasha Levin <sashal@kernel.org>