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xen-devel
[Xen-devel] Re: [PATCH V3 1/2] mm: Add SECTION_ALIGN_UP() and SECTION_AL
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To: |
Daniel Kiper <dkiper@xxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH V3 1/2] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro |
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From: |
David Rientjes <rientjes@xxxxxxxxxx> |
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Date: |
Wed, 18 May 2011 20:21:23 -0700 (PDT) |
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jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, ian.campbell@xxxxxxxxxx, haicheng.li@xxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dan.magenheimer@xxxxxxxxxx, v.tolstov@xxxxxxxxx, Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, Andi Kleen <andi.kleen@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, fengguang.wu@xxxxxxxxx, wdauchy@xxxxxxxxx |
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Wed, 18 May 2011 20:22:29 -0700 |
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Alpine 2.00 (DEB 1167 2008-08-23) |
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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