Some doubts about ZONE_NORMAL and ZONE_HIGHMEM

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>From previous posting, Mulyadi mentioned that page mapping in
ZONE_NORMAL being the default mapping.   So my questions are these:

If default mapping (via cr3/pgd mechanism) is ZONE_NORMAL, then how do
we allocate memory in the ZONE_HIGHMEM region?   (ie, does
__get_free_pages() or alloc_pages() return us anything in those
region?)

-- 
Regards,
Peter Teoh

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