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xen-devel
[Xen-devel] Re: [PATCH 2/3] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN
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To: |
David Rientjes <rientjes@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 2/3] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro |
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From: |
Daniel Kiper <dkiper@xxxxxxxxxxxx> |
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Date: |
Tue, 29 Mar 2011 19:32:21 +0200 |
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Cc: |
jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, ian.campbell@xxxxxxxxxx, haicheng.li@xxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dan.magenheimer@xxxxxxxxxx, v.tolstov@xxxxxxxxx, dave@xxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, andi.kleen@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, fengguang.wu@xxxxxxxxx, Daniel Kiper <dkiper@xxxxxxxxxxxx>, wdauchy@xxxxxxxxx |
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Tue, 29 Mar 2011 10:33:56 -0700 |
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Mutt/1.3.28i |
On Mon, Mar 28, 2011 at 03:46:27PM -0700, David Rientjes wrote:
> On Mon, 28 Mar 2011, Daniel Kiper wrote:
>
> > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> > index 02ecb01..d342820 100644
> > --- a/include/linux/mmzone.h
> > +++ b/include/linux/mmzone.h
> > @@ -931,6 +931,9 @@ 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)
> > +
> > #ifdef CONFIG_SPARSEMEM
> >
> > /*
>
> These are only valid for CONFIG_SPARSEMEM, so they need to be defined
> conditionally.
OK, however, I think that pfn_to_section_nr()/section_nr_to_pfn()
should be defined conditionally, too.
Daniel
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