Re: [PATCH v2 0/8] sparc64: MM/IRQ patch queue.

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From: Bob Picco <bpicco@xxxxxxxxxx>
Date: Thu, 2 Oct 2014 10:24:35 -0400

> At this commit:
> 59a35b1 sparc64: Use kernel page tables for vmemmap.

I think I figured out what the bug is.

It has to do with how KERN_PGTABLE_WALK masks in the sub-pagesize
bits for huge pages.

That assembler works fine for PAGE_OFFSET mappings where the
sub-pagesize bits always have a direct correspondance to the
physical bits.  But for something like vmemmap that doesn't
work.

I'll verify this and work on a fix.
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