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mm: add zone_is_empty() and zone_is_initialized()

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Factoring out these 2 checks makes it more clear what we are actually
checking for.

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 16:35:24 -08:00 committed by Linus Torvalds
parent 108bcc96ef
commit 2a6e3ebee2
1 changed files with 10 additions and 0 deletions
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10
include/linux/mmzone.h
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@ -537,6 +537,16 @@ static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn)
return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone);
}
static inline bool zone_is_initialized(struct zone *zone)
{
return !!zone->wait_table;
}
static inline bool zone_is_empty(struct zone *zone)
{
return zone->spanned_pages == 0;
}
/*
* The "priority" of VM scanning is how much of the queues we will scan in one
* go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the