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    From
    SubjectRe: Big Fix for 2.2.1
    Date
    > (1) The identity phys_to_virt(virt_to_phys(x)) == x is violated.
    >
    > (2) The readb/writeb/readw/writew/readl/writel macros are completely incorrect
    > since they are supposed to be applied to memory mapped I/O regions
    > allocated with ioremap, but ioremap returns a kernel virtual address
    > and hence no further mapping is appropriate.

    This change breaks half the drivers in the kernel. Everything assumes they
    take physical addresses.



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