linux-kernel - Re: [PATCH 1/2] pagemap: add #ifdefs CONFIG_HUGETLB

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Message-ID: <20100319083025.GA13107@spritzerA.linux.bs1.fc.nec.co.jp>
Date:	Fri, 19 Mar 2010 17:30:25 +0900
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, andi.kleen@...el.com,
	fengguang.wu@...el.com
Subject: Re: [PATCH 1/2] pagemap: add #ifdefs CONFIG_HUGETLB_PAGE on code
	walking hugetlb vma

On Fri, Mar 19, 2010 at 04:15:04PM +0900, KAMEZAWA Hiroyuki wrote:
> On Fri, 19 Mar 2010 15:53:34 +0900
> Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:
> 
> > On Fri, Mar 19, 2010 at 03:29:34PM +0900, KAMEZAWA Hiroyuki wrote:
> > > On Fri, 19 Mar 2010 15:26:35 +0900
> > > Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:
> > > 
> > > > If !CONFIG_HUGETLB_PAGE, pagemap_hugetlb_range() is never called.
> > > > So put it (and its calling function) into #ifdef block.
> > > > 
> > > > Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> > > 
> > > Hmm? What is benefit ? Is this broken now ?
> > > 
> > 
> > Not broken, but this is needed to avoid build error with patch 2/2 applied,
> > where I move huge_pte_offset() (not defined when !HUGETLB_PAGE)
> > into pagemap_hugetlb_range().
> > 
> 
> I think this should be merged with 2/2....if necessary.
> 

I split them for ease of review.
Also removing unused code is beneficial as it reduces kernel binary size.

But if you really want, I can merge them into one patch.

Thanks,
Naoya Horiguchi
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