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Currently, all the time limits in the bonding ARP monitor are in multiples of arp_interval -- the time interval at which the ARP monitor is periodically scheduled. With a fast network round-trip and a little scheduling latency of the ARP monitor work, a limit of n*delta_in_ticks may effectively mean (n-1)*delta_in_ticks. This is fatal in case of n==1 (the link will stay down forever) and makes the behaviour non-deterministic in all the other cases. Add a delta_in_ticks/2 time slack to all the time limits. Signed-off-by: Jiri Bohac <jbohac@suse.cz> Signed-off-by: David S. Miller <davem@davemloft.net>