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

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Date:	Mon, 30 Jan 2012 14:27:09 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, 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 Mon, Jan 30, 2012 at 03:31:11PM +0900, KAMEZAWA Hiroyuki wrote:
> 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 ?

OK, I'll use this type name.

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

We had better avoid this type of confusion if possible.

Thanks,
Naoya
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