That name seems slightly misleading (PFN is usually associated with physical ranges, this is a virtual range). Maybe something like MM_VPN_BITS_SIZE would be better. If it is not used anywhere else, I'd just use an #ifdef _WIN64 ... (assuming it's the same for all 32 bit and the same for all 64 bit architectures)
Am 30.07.2014 15:11, schrieb jgardou@svn.reactos.org:
+#define MM_PAGE_FRAME_NUMBER_SIZE 52