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    SubjectRe: [PATCH] New phys_addr() syscall
    Followup to:  <199807190553.PAA00379@workaholix.atnf.CSIRO.AU>
    By author:
    In newsgroup:
    > Hi, all. I've implemented a simple new system call called
    > phys_addr() which converts a virtual address to a physical
    > address. This is useful for memory testing programmes so you can find
    > out which SIMM/DIMM is causing trouble (yeah, I've got intermittent
    > memory problems in one of my machines, and I want to nail the bugger).
    > Sure, I know about memtest86, but it doesn't seem to find the problem,
    > whereas my userspace tester does.
    > People writing pure userspace network drivers may also find this handy
    > if they want to DMA directly into userspace.
    > I've only bothered with ix86 syscalls for now. Comments welcome. Patch
    > against 2.1.109 below.

    Question: how do you know when this is still accurate? The kernel can
    change the mapping without notice, except perhaps when using mlock()
    (even then?)

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