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In systems where neigh gc thresh holds are set to high values, admin deleted neigh entries (eg ip neigh flush or ip neigh del) can linger around in NUD_FAILED state for a long time until periodic gc kicks in. This patch forces neigh_invalidate when NUD_FAILED neigh_update is from an admin. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>