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Commit 9127ab4f authored by Cody P Schafer's avatar Cody P Schafer Committed by Linus Torvalds
Browse files

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: default avatarCody 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4805b02e

include/linux/mm.h

+6 −2
Original line number Diff line number Diff line
@@ -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

}