linux-kernel - Re: [PATCH V3 1/2] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN

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Message-ID: <alpine.DEB.2.00.1105182019170.20651@chino.kir.corp.google.com>
Date:	Wed, 18 May 2011 20:21:23 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Daniel Kiper <dkiper@...-space.pl>
cc:	ian.campbell@...rix.com, Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi.kleen@...el.com>, haicheng.li@...ux.intel.com,
	fengguang.wu@...el.com, jeremy@...p.org, konrad.wilk@...cle.com,
	dan.magenheimer@...cle.com, v.tolstov@...fip.ru, pasik@....fi,
	Dave Hansen <dave@...ux.vnet.ibm.com>, wdauchy@...il.com,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH V3 1/2] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN()
 macro

On Tue, 17 May 2011, Daniel Kiper wrote:

> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index d715200..217bcf6 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -956,6 +956,9 @@ static inline unsigned long early_pfn_to_nid(unsigned long pfn)
>  #define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT)
>  #define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT)
>  
> +#define SECTION_ALIGN_UP(pfn)	(((pfn) + PAGES_PER_SECTION - 1) & PAGE_SECTION_MASK)
> +#define SECTION_ALIGN_DOWN(pfn)	((pfn) & PAGE_SECTION_MASK)
> +
>  struct page;
>  struct page_cgroup;
>  struct mem_section {

These seem useful.  Could you convert the code in drivers/base/node.c, 
mm/page_cgroup.c, mm/page_alloc.c, and mm/sparse.c that already do this to 
use the new macros?
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