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Add two helper functions: sysctl_set() to change the value of a given sysctl setting, and sysctl_restore() to change it back to what it was. Signed-off-by: Petr Machata <petrm@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>