You tell me. You're saying a billion pages (((unsigned long)(~0)) >> 2) also crashes) is never
going to be realistically possible?
On a 32-bit system? No. x86 cpus are architectually limited
to 64GB of memory, shift that right by PAGE_SIZE (13) and we're
still within bounds.
Larger memory will be then be found on 64-bit systems, and hey
then the limit becomes significantly higher.
So that is exactly what I am saying, it is not realistically
possible.
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