effective_cache_size calculation overflow

To test something unrelated, I set my shared_buffers to 7TB on my laptop
today (no, unfortunately I don't have that much RAM).

That leads to the startup error:

FATAL: -536870912 is outside the valid range for parameter
"effective_cache_size" (-1 .. 2147483647)

So clearly there is an overflow somewhere in the calculation of
effective_cache_size, most likely from the fact that it's now dynamically
calculated.

--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/