It will never work. It's not supposed to. Anybody trying to do that is
buggy.
The "virt_to_phys()" and "virt_to_bus()" things are _only_ supposed to
work on normal kernel mappings, the kind of mappings you get from
"get_free_pages()" etc. Assuming anything else is just stupid, because it
assumes a level of complexity that I never want to see.
Linus
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