tcp: syncookies: do not use getnstimeofday()
While it is true that getnstimeofday() uses about 40 cycles if TSC is available, it can use 1600 cycles if hpet is the clocksource. Switch to get_jiffies_64(), as this is more than enough, and go back to 60 seconds periods. Fixes: 8c27bd75 ("tcp: syncookies: reduce cookie lifetime to 128 seconds") Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Florian Westphal <fw@strlen.de> Acked-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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