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    SubjectRe: [patch] scheduler fixes, 2.5.32-BK

    we used to have the global semaphore_lock - which, if used separately from
    the waitqueue lock, indeed can cause the unuse of the semaphore structure
    before the spin_unlock in wakeup() completes.

    but since 2.5.25 or so we use the semaphore waitqueue's spinlock for
    semaphore locking - this also neatly solves the semaphore-unuse problem.
    Four architectures, sparc, ia64, arm and x86-64 still use the global
    semaphore_lock, but the other 13 architectures use the waitqueue spinlock

    (unless there's something else i missed.)


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