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mm: add SECTION_IN_PAGE_FLAGS

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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>
This commit is contained in:
Cody P Schafer 2013-02-22 16:35:21 -08:00 committed by Linus Torvalds
parent 4805b02e90
commit 9127ab4ff9
1 changed files with 6 additions and 2 deletions
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8
include/linux/mm.h
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@ -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
}