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    Subject[PATCH 1/9] mm: add SECTION_IN_PAGE_FLAGS
    Date
    Instead of directly utilizing a combination of config options to determine this,
    add a macro to specifically address it.

    Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
    ---
    include/linux/mm.h | 8 ++++++--
    1 file changed, 6 insertions(+), 2 deletions(-)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index 66e2f7c..ef69564 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -625,6 +625,10 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
    #define NODE_NOT_IN_PAGE_FLAGS
    #endif

    +#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
    +#define SECTION_IN_PAGE_FLAGS
    +#endif
    +
    /*
    * Define the bit shifts to access each section. For non-existent
    * sections we define the shift as 0; that plus a 0 mask ensures
    @@ -727,7 +731,7 @@ static inline struct zone *page_zone(const struct page *page)
    return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
    }

    -#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
    +#ifdef SECTION_IN_PAGE_FLAGS
    static inline void set_page_section(struct page *page, unsigned long section)
    {
    page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
    @@ -757,7 +761,7 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
    {
    set_page_zone(page, zone);
    set_page_node(page, node);
    -#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
    +#ifdef SECTION_IN_PAGE_FLAGS
    set_page_section(page, pfn_to_section_nr(pfn));
    #endif
    }
    --
    1.8.0.3


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