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> Anyway, my original question has not yet been answered: why is it that I can
> ioremap() any physical page by simply setting one bit, but I cannot always
> iounmap() it? Why can't iounmap() simply undo what ioremap() did?

The fact you can doesn't mean you should. You need to be sole owner of that
page before you can fiddle with the reserved bit. You were not sole owner

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