[TCP]: TCP Compound quad root function
The original code did a 64 bit divide directly, which won't work on 32 bit platforms. Rather than doing a 64 bit square root twice, just implement a 4th root function in one pass using Newton's method. Signed-off-by: NStephen Hemminger <shemminger@osdl.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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