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    SubjectRe: copy_from_user/copy_to_user question
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    On Sat, 2005-12-03 at 15:35 -0700, Andi Kleen wrote:
    > Steven Rostedt <rostedt@goodmis.org> writes:
    > >
    > > Nope, the kernel is always locked into memory. If you take a page fault
    > > from the kernel world, you will crash and burn. The kernel is never
    > > "swapped out". So if you are in kernel mode, going into do_page_fault
    > > in arch/i386/mm/fault.c there is no path to swap a page in.
    >
    > Actually there is - when the page fault was caused by *_user.

    Sorry I wasn't clearer. I know the copy_user case (and explained it in
    detail earlier in this thread). I was talking about what happens in the
    memcpy case. So that should have said "outside of copy_user and
    friends, there is no path to swap a page in".

    -- Steve


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