To make sure a range intersects a zone, only two comparison is necessary.
This patch simplifies the function a little.
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
---
include/linux/mmzone.h | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 0176a2933c61..7e8f100cb56d 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -541,15 +541,11 @@ static inline bool zone_intersects(struct zone *zone,
{
if (zone_is_empty(zone))
return false;
- if (start_pfn >= zone_end_pfn(zone))
+ if (start_pfn >= zone_end_pfn(zone) ||
+ start_pfn + nr_pages <= zone->zone_start_pfn)
return false;
- if (zone->zone_start_pfn <= start_pfn)
- return true;
- if (start_pfn + nr_pages > zone->zone_start_pfn)
- return true;
-
- return false;
+ return true;
}
/*
--
2.11.0
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