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    SubjectRe: [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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