linux-kernel - Re: [PATCH v4] kpageflags: fix wrong KPF

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Message-ID: <20120927012057.GE7205@localhost>
Date:	Thu, 27 Sep 2012 09:20:57 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Andi Kleen <andi.kleen@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] kpageflags: fix wrong KPF_THP on non-huge compound
 pages

> -	else if (PageTransCompound(page))
> +	/*
> +	 * PageTransCompound can be true for non-huge compound pages (slab
> +	 * pages or pages allocated by drivers with __GFP_COMP) because it
> +	 * just checks PG_head/PG_tail, so we need to check PageLRU to make
> +	 * sure a given page is a thp, not a non-huge compound page.
> +	 */
> +	else if (PageTransCompound(page) && PageLRU(compound_trans_head(page)))
>  		u |= 1 << KPF_THP;

Reviewed-by: Fengguang Wu <fengguang.wu@...el.com>

Thanks!
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