Re: [PATCH v3] mm: make expand_downwards symmetrical toexpand_upwards

[David Rientjes]

On Thu, 21 Apr 2011, KOSAKI Motohiro wrote:

> ia64 and mips have CONFIG_ARCH_POPULATES_NODE_MAP and it initialize
> N_NORMAL_MEMORY automatically if my understand is correct.
> (plz see free_area_init_nodes)
> 

ia64 doesn't enable CONFIG_HIGHMEM, so it never gets set via this generic 
code; mips also doesn't enable it for all configs even for 32-bit.

So we'll either want to take check_for_regular_memory() out from under 
CONFIG_HIGHMEM and do it for all configs or teach slub to use 
N_HIGH_MEMORY rather than N_NORMAL_MEMORY.
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