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    SubjectRe: [PATCH/RFC] Futex mmap_sem deadlock
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    On Tue, 2005-02-22 at 11:36 -0800, Linus Torvalds wrote:

    > DavidH - what's the word on nested read-semaphores like this? Are they
    > supposed to work (like nested read-spinlocks), or do we need to do the
    > things Olof does?

    Isn't Olof scheme racy ? Can't the stuff get swapped out between the
    first get_user() and the "real" one ?

    Ben.


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