PAGE_SIZE on 64bit and 32bit machines

According to my knowledge the PAGE_SIZE on 32bit architectures in 4KB. Logically, the PAGE_SIZE on 64bit architectures should be 8KB. That's at least the way I understand it. However, looking at the kernel code of x86_64, I see the PAGE_SIZE is 4KB.

Can anyone explain to me what am I missing here?


Thanks

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