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SubjectRe: [PATCH 5/6] Have ia64 use add_active_range() and free_area_init_nodes
KAMEZAWA Hiroyuki wrote:

>Andy's page_zone(page) == page_zone(buddy) check is good, I think.
>Making alignment is a difficult problem, I think. It complecates many things.
>We can avoid above check only when memory layout is ideal.
>BTW, How about following patch ?
>I don't want to say "Oh, you have to re-compile your kernel with
>CONFIG_UNALIGNED_ZONE on your new machine. you are unlucky." to users.

No, this is a function of the architecture code, not the specific
machine it is running on.

So if the architecture ensures alignment and no holes, then they don't

If they do not ensure correct alignment, then they must enable
CONFIG_UNALIGNED_ZONE, even if there may be actual systems which do
result in aligned zones.

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