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    SubjectRe: [PATCH] Mark i2o config broken on 64-bit platforms.
    Alan Cox <> wrote:

    > 64bit kernel 32bit user space should be fine,

    There's a place I pointed out in an earlier email where it appears a 64-bit
    kernel can screw up, even with a 32-bit userspace. It allocates a piece of
    RAM with kmalloc(), takes the address of it, passes that through
    virt_to_bus(), discards the upper 32-bits from the result and posts it in an
    I2O message, presumably to the device. That would appear likely to go kaboom
    on a 64-bit system with more than 4GB of RAM.

    If the device doesn't use that address, then why pass it at all?


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