[PATCH 3/3] mm/kmemleak.c: Merge the consecutive scan-areas.

[Jianpeng Ma]

If the scan-areas are adjacent,it can merge in order to reduce memomy.
And using pr_warn instead of pr_warning.

Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
---
 mm/kmemleak.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f0ece93..9590a57 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -746,24 +746,36 @@ static void add_scan_area(unsigned long ptr, size_t size, gfp_t gfp)
 		return;
 	}
 
-	area = kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp));
-	if (!area) {
-		pr_warning("Cannot allocate a scan area\n");
-		goto out;
-	}
-
 	spin_lock_irqsave(&object->lock, flags);
 	if (ptr + size > object->pointer + object->size) {
 		kmemleak_warn("Scan area larger than object 0x%08lx\n", ptr);
 		dump_object_info(object);
-		kmem_cache_free(scan_area_cache, area);
 		goto out_unlock;
 	}
+	hlist_for_each_entry(area, &object->area_list, node) {
+		if (ptr + size == area->start) {
+			area->start = ptr;
+			area->size += size;
+			goto out_unlock;
+		} else if (ptr == area->start + area->size) {
+			area->size += size;
+			goto out_unlock;
+		}
+
+	}
+	spin_unlock_irqrestore(&object->lock, flags);
+
+	area = kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp));
+	if (!area) {
+		pr_warn("Cannot allocate a scan area\n");
+		goto out;
+	}
 
 	INIT_HLIST_NODE(&area->node);
 	area->start = ptr;
 	area->size = size;
 
+	spin_lock_irqsave(&object->lock, flags);
 	hlist_add_head(&area->node, &object->area_list);
 out_unlock:
 	spin_unlock_irqrestore(&object->lock, flags);
-- 
1.8.3.rc1.44.gb387c77


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