Speculating on page faults

Yea, the more I read on LKML and the Linux x86-64 mailing lists, the more I think that developing the x86-64 port separately from the main x86 port was a big mistake in the first place. Look at the way the ACPI SRAT support was developed on the 32-bit and 64-bit side for an example, ACPI SRAT is supposed to be a *standard*, but before it was finally fixed in the year 2008, 32-bit SRAT/NUMA only worked for Summit systems, and not Opterons. Another example is AMD64 IOMMU support, which could have been supported on 32-bit Linux with PAE, but never was. It is now being gradually being fixed, but it was still stupid to do it in the first place.