linux-kernel - Re: [PATCH 4/7] proc: export more page flags in /proc/kpageflags

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Message-Id: <20090507114016.40ee6577.minchan.kim@barrios-desktop>
Date:	Thu, 7 May 2009 11:40:16 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Mackall <mpm@...enic.com>,
	Alexey Dobriyan <adobriyan@...il.com>, <linux-mm@...ck.org>
Subject: Re: [PATCH 4/7] proc: export more page flags in /proc/kpageflags

On Thu, 07 May 2009 09:21:21 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> +	 * pseudo flags for the well known (anonymous) memory mapped pages
> +	 */
> +	if (!PageSlab(page) && page_mapped(page))
> +		u |= 1 << KPF_MMAP;
> +	if (PageAnon(page))
> +		u |= 1 << KPF_ANON;

Why do you check PageSlab on user pages ?
Is there any case that PageSlab == true && page_mapped == true ?

-- 
Kinds Regards
Minchan Kim
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