CACHE_NEW_EXPIRY is 120, nextcheck initialized to 30*60=1800?

[Rob Landley <rlandley@xxxxxxxxxxxxx>]

In net/sunrpc/cache.c line 416 or so (function cache_clean()) there's
this bit:

else {
        current_index = 0;
        current_detail->nextcheck = seconds_since_boot()+30*60;
}

The other uses of seconds_since_boot() add CACHE_NEW_EXPIRY (which is
120).  This is A) more than ten times that, B) a magic inline constant.

Is there a reason for this?  (Some subtle cache lifetime balancing thing?)

Rob
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