diff options
| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2013-02-22 16:35:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:20 -0800 |
| commit | 108bcc96ef7047c02cad4d229f04da38186a3f3f (patch) | |
| tree | e11d82074cae54dcf0fa8eea12750c661a16b02d /include/linux/mmzone.h | |
| parent | 9127ab4ff92f0ecd7b4671efa9d0edb21c691e9f (diff) | |
mm: add & use zone_end_pfn() and zone_spans_pfn()
Add 2 helpers (zone_end_pfn() and zone_spans_pfn()) to reduce code
duplication.
This also switches to using them in compaction (where an additional
variable needed to be renamed), page_alloc, vmstat, memory_hotplug, and
kmemleak.
Note that in compaction.c I avoid calling zone_end_pfn() repeatedly
because I expect at some point the sycronization issues with start_pfn &
spanned_pages will need fixing, either by actually using the seqlock or
clever memory barrier usage.
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>
Diffstat (limited to 'include/linux/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 6c80d0ac14dd..34343f51e211 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -527,6 +527,16 @@ static inline int zone_is_oom_locked(const struct zone *zone) return test_bit(ZONE_OOM_LOCKED, &zone->flags); } +static inline unsigned zone_end_pfn(const struct zone *zone) +{ + return zone->zone_start_pfn + zone->spanned_pages; +} + +static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn) +{ + return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone); +} + /* * 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 |