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

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Date:	Thu, 19 May 2011 21:56:53 +0200
From:	Daniel Kiper <dkiper@...-space.pl>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Daniel Kiper <dkiper@...-space.pl>, 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 Wed, May 18, 2011 at 08:21:23PM -0700, David Rientjes wrote:
> 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?

No problem. I do that in next week or two.

Daniel
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