What happens if CONFIG_KERNEL_START != CONFIG_PAGE_OFFSET and the kernel is loaded at some address != CONFIG_PHYSICAL_START?
Assuming its not a CONFIG_RELOCATABLE kernel than bad things. Is there some concern you have here?
Are we sure that ARCH_PFN_OFFSET only gets applied to normal memory pages, not any I/O?
correct. ioremap uses map_page which isn't effected by ARCH_PFN_OFFSET
What happens to /dev/mem when ARCH_PFN_OFFSET != 0?
it behaves the same. You provide a physical address and it provides access to it. (so you could access memory you aren't suppose to)
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