On Fri, 17 Jun 2016 08:05:55 +0200, Peter Hunkeler wrote: > >>> Is the highest 31-bit address 7FFFFFFF or 7FFF0000? >>> I ask because the largest region size you can request is 2096128K or >>> 2047M, and 2096128 * 1024 = 2,146,435,072 (x7FF00000). > > >>For diagnostic purposes, then 4K page at 7FFFF000 is always >>left invalid in z/OS. > >That makes the highest numbered, accessible byte to be at address x'7FFFEFFF' > That might be due to a requirement of ANSI C that there always be an address algebraically greater than that of any accessible object, for loop termination conditions.
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