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    Subject[WTF?] sys_tas() on m32r
    asmlinkage int sys_tas(int *addr)
    {
    int oldval;
    unsigned long flags;

    if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
    return -EFAULT;
    local_irq_save(flags);
    oldval = *addr;
    if (!oldval)
    *addr = 1;
    local_irq_restore(flags);
    return oldval;
    }
    in arch/m32r/kernel/sys_m32r.c. Trivial oops *AND* ability to trigger
    IO with interrupts disabled.
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