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由 Gao Feng 提交于
When user_mss is zero, it means use the default value. But the current codes don't permit user set TCP_MAXSEG to the default value. It would return the -EINVAL when val is zero. Signed-off-by: NGao Feng <fgao@ikuai8.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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