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Date: Fri, 9 May 2008 09:25:41 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: Heiko Carstens <heiko.carstens@de.ibm.com>
cc: Andrew Morton <akpm@linux-foundation.org>,
       Andy Whitcroft <apw@shadowen.org>,
       Gerald Schaefer <gerald.schaefer@de.ibm.com>,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] sparsemem vmemmap: initialize memmap.
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Nack. vmemmap_alloc_block does 

void * __meminit vmemmap_alloc_block(unsigned long size, int node)
{
        /* If the main allocator is up use that, fallback to bootmem. */
        if (slab_is_available()) {
                struct page *page = alloc_pages_node(node,
                                GFP_KERNEL | __GFP_ZERO, get_order(size));
                if (page)
                        return page_address(page);
                return NULL;
        } else
                return __earlyonly_bootmem_alloc(node, size, size,
                                __pa(MAX_DMA_ADDRESS));
}

memory is always zeroed. Maybe you use an alternate implementation that is 
broken?