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[ Upstream commit 5eb902b8e7193cdcb33242af0a56502e6b5206e9 ] FIB6 GC walks trees of fib6_tables to remove expired routes. Walking a tree can be expensive if the number of routes in a table is big, even if most of them are permanent. Checking routes in a separated list of routes having expiration will avoid this potential issue. Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of: f72514b3c569 ("ipv6: clear RA flags when adding a static route") Signed-off-by: Sasha Levin <sashal@kernel.org>