On Thu, 15 May 2008, Andy Whitcroft wrote:

quoted text
> Now that we have a single enum to generate the bit orders it makes sense
> to express overlays in the same place.  So create per use aliases for
> this bit in the main page-flags enum and use those in the accessors.

Well I thought it would be better to have the overlays defined when the 
PAGEFLAGS_xx macro is used. If that is done then every PG_xxx has a unique 
id. The aliasing is then only through PageXXXX() using a PG_yyy
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