This sets the initial jiffies value to 0x00000000fffb6c20, which can trigger
32-bit wraparound bugs: if some random jiffy counter wraps from
0x00000000ffffffff to 0x0000000000000000 then things fail.
davem was bitten by at least one such bug in the qlogicfc driver. It would
have caused 64-bit machines to fail after 49 days.
It turns out that it is more valuable to test for this than to test for
64-bit wraparound bugs.
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