Re: [BUGFIX][PATCH] Fix usemap initialization v3

[Shi Weihua]

KAMEZAWA Hiroyuki wrote::
> fixed typos.
> ==
> usemap must be initialized only when pfn is within zone.
> If not, it corrupts memory.
> 
> And this patch also reduces the number of calls to set_pageblock_migratetype()
> from
> 	(pfn & (pageblock_nr_pages -1)
> to
> 	!(pfn & (pageblock_nr_pages-1)
> it should be called once per pageblock.
> 
> Changelog.
> v2->v3
>  - Fixed typos.
> v1->v2
>  - Fixed boundary check.
>  - Move calculation of pointer for zone struct to out of loop.

I noticed v3 takes "zone" instead of "zid" in the code line 
"z = &NODE_DATA(nid)->node_zones[zone];".
I tested v3, it works well now.

Thanks,
-Shi

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