linux-kernel - Re: [PATCH 6/6] pagemap: introduce data structure for pagemap entry

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Message-Id: <20120130153111.4fefb09a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 30 Jan 2012 15:31:11 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] pagemap: introduce data structure for pagemap entry

On Fri, 27 Jan 2012 18:02:53 -0500
Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> Currently a local variable of pagemap entry in pagemap_pte_range()
> is named pfn and typed with u64, but it's not correct (pfn should
> be unsigned long.)
> This patch introduces special type for pagemap entry and replace
> code with it.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  fs/proc/task_mmu.c |   66 +++++++++++++++++++++++++++------------------------
>  1 files changed, 35 insertions(+), 31 deletions(-)
> 
> diff --git 3.3-rc1.orig/fs/proc/task_mmu.c 3.3-rc1/fs/proc/task_mmu.c
> index e2063d9..c2807a3 100644
> --- 3.3-rc1.orig/fs/proc/task_mmu.c
> +++ 3.3-rc1/fs/proc/task_mmu.c
> @@ -586,9 +586,13 @@ const struct file_operations proc_clear_refs_operations = {
>  	.llseek		= noop_llseek,
>  };
>  
> +typedef struct {
> +	u64 pme;
> +} pme_t;
> +

A nitpick..

How about pagemap_entry_t rather than pme_t ?

At 1st look, I wondered whether this is a new kind of page table entry type or not ..

Thanks,
-Kame

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