All definitions are equal except ACPI_UINT64_MAX for CONFIG_IA64.  It
   is changed from sizeof(unsigned long) to sizeof(unsigned long long).
   By investigation, 64bit Linux kernel build is LP64 compliant, i.e.,
   sizeof(long) and (pointer) are 64.  As sizeof(unsigned long) equals to
   sizeof(unsigned long long) on IA64 platform where CONFIG_64BIT cannot be
   disabled, this change actually will not affect the value of
   ACPI_UINT64_MAX on IA64 platforms.

This all looks correct to me - it really shouldn't make any difference
to ia64 whether we use "long" or "long long" ... both are 8-byte entities.
The compiler would complain in some places if you mixed & matched
incorrectly (e.g. printk("val = %ld\n", val); will give a warning if val has
been switched from "long" to "long long" and the format would need
to change to "%lld").  But it looks like nothing like that happens as a
result of this patch. All my ia64 configs build with no new warnings.

Boots OK too.

-Tony