Why do we set _PAGE_DIRTY for page tables?

[H. Peter Anvin]

I just noticed this:

#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |       \
                         _PAGE_ACCESSED | _PAGE_DIRTY)
#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |   \
                         _PAGE_DIRTY)

Is there a reason we set _PAGE_DIRTY for page tables?  It has no
function, but doesn't do any harm either (the dirty bit is ignored for
page tables)... it just looks funny to me.

	-hpa
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