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[Xen-devel] difference between PGT_gdt_page and PGT_ldt_page

Is there any particular reason why there cannot just be a PGT_descr_page, 
combining the two currently existing types?
Even if it's only a page, I'd want to avoid wasting memory for nothing, and 
i386's default_ldt could easily move into
the same page cpu_gdt_table lives in. Alternatively one could also use 
empty_zero_page here. Or do it like on x86-64,
where the symbol doesn't exist at all, and knowledge about it being all zeroes 
is used where needed. Jan

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