[WTF?] sys_tas() on m32r

[Al Viro]

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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