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[PATCH] reduce MAX_NR_ZONES: use enum to define zones, reformat and comment

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Use enum for zones and reformat zones dependent information

Add comments explaning the use of zones and add a zones_t type for zone
numbers.

Line up information that will be #ifdefd by the following patches.

[akpm@osdl.org: comment cleanups]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter
2006-09-25 23:31:13 -07:00
committed by Linus Torvalds
parent 98d2b0ebda
commit 2f1b624868
3 changed files with 69 additions and 28 deletions
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7
include/linux/mm.h
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@ -470,7 +470,7 @@ void split_page(struct page *page, unsigned int order);
#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
#define ZONETABLE_MASK ((1UL << ZONETABLE_SHIFT) - 1)
static inline unsigned long page_zonenum(struct page *page)
static inline enum zone_type page_zonenum(struct page *page)
{
return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
}
@ -499,11 +499,12 @@ static inline unsigned long page_to_section(struct page *page)
return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
}
static inline void set_page_zone(struct page *page, unsigned long zone)
static inline void set_page_zone(struct page *page, enum zone_type zone)
{
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
}
static inline void set_page_node(struct page *page, unsigned long node)
{
page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
@ -515,7 +516,7 @@ static inline void set_page_section(struct page *page, unsigned long section)
page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
}
static inline void set_page_links(struct page *page, unsigned long zone,
static inline void set_page_links(struct page *page, enum zone_type zone,
unsigned long node, unsigned long pfn)
{
set_page_zone(page, zone);