xen-devel
[Xen-devel] Re: [PATCH 2/3] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN
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To: |
Daniel Kiper <dkiper@xxxxxxxxxxxx> |
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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: |
Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> |
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Date: |
2011年3月28日 08:41:24 -0700 |
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Cc: |
jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, ian.campbell@xxxxxxxxxx, haicheng.li@xxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, dan.magenheimer@xxxxxxxxxx, v.tolstov@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, rientjes@xxxxxxxxxx, andi.kleen@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, fengguang.wu@xxxxxxxxx, wdauchy@xxxxxxxxx |
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2011年3月28日 08:42:21 -0700 |
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<20110328092412.GC13826@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
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On Mon, 2011年03月28日 at 11:24 +0200, Daniel Kiper wrote:
> Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro which aligns
> given pfn to upper section and lower section boundary accordingly.
>
> Signed-off-by: Daniel Kiper <dkiper@xxxxxxxxxxxx>
> ---
> include/linux/mmzone.h | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> 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)
There are certainly a lot of different ways to do this, including using
the existing ALIGN() macro, but you won't be the first to open-code
it. :)
Acked-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
-- Dave
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