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>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index fe039bdba4ed..97da0302cf51 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -625,6 +625,10 @@ static inline enum zone_type page_zonenum(const struct page *page)
         return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
 }
 
+#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
+#define SECTION_IN_PAGE_FLAGS
+#endif
+
 /*
  * The identification function is only used by the buddy allocator for
  * determining if two pages could be buddies. We are not really
@@ -708,7 +712,7 @@ 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);
@@ -738,7 +742,7 @@ 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
 }