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> I've considered making "free_page()" a macro something like
>
> __free_pge(x);
> x = NULL;
>
> but that works only for lvalues, of course, and not all users are
> lvalue-users, so it's hard to do. But that would have caught this.

Not that hard. (barf buckets at the ready)

*((unsigned long *)(&x)) = NULL;

Alan

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