linux-kernel - Re: [patch 3/7] mm: speculative page references

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Message-ID: <Pine.LNX.4.64.0806101205480.17798@schroedinger.engr.sgi.com>
Date:	Tue, 10 Jun 2008 12:08:27 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	npiggin@...e.de
cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, paulus@...ba.org
Subject: Re: [patch 3/7] mm: speculative page references

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

> +		 * 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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