On Thu, 5 Jun 2008, npiggin@suse.de wrote:

quoted text
> +		 * do the right thing (see comments above).
> +		 */
> +		return 0;
> +	}
> +#endif
> +	VM_BUG_ON(PageCompound(page) && (struct page *)page_private(page) != page);

This is easier written as:

== VM_BUG_ON(PageTail(page)

And its also slightly incorrect since page_private(page) is not pointing 
to the head page for PageHead(page).
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