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mm: add SECTION_IN_PAGE_FLAGS
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> Cc: David Hansen <dave@linux.vnet.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 6 additions and 2 deletions
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@ -625,6 +625,10 @@ static inline enum zone_type page_zonenum(const struct page *page)
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return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
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}
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#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
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#define SECTION_IN_PAGE_FLAGS
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#endif
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/*
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* The identification function is only used by the buddy allocator for
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* determining if two pages could be buddies. We are not really
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@ -708,7 +712,7 @@ static inline struct zone *page_zone(const struct page *page)
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return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
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}
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#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
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#ifdef SECTION_IN_PAGE_FLAGS
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static inline void set_page_section(struct page *page, unsigned long section)
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{
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page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
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@ -738,7 +742,7 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
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{
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set_page_zone(page, zone);
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set_page_node(page, node);
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#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
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#ifdef SECTION_IN_PAGE_FLAGS
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set_page_section(page, pfn_to_section_nr(pfn));
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#endif
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}
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