X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Frmap.c;h=22ed3f71a67421831f12b0deffa915eacf5d1db7;hb=7f375f325feacd8a628e00e0d53390a4f6d8abc2;hp=669acb22b572190ff2dcc6544c968bbd7516859e;hpb=a7ec3f5289681e9d63b65db5f56857f998812b4b;p=powerpc.git

diff --git a/mm/rmap.c b/mm/rmap.c
index 669acb22b5..22ed3f71a6 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -183,7 +183,7 @@ void __init anon_vma_init(void)
  */
 static struct anon_vma *page_lock_anon_vma(struct page *page)
 {
-	struct anon_vma *anon_vma = NULL;
+	struct anon_vma *anon_vma;
 	unsigned long anon_mapping;
 
 	rcu_read_lock();
@@ -195,9 +195,16 @@ static struct anon_vma *page_lock_anon_vma(struct page *page)
 
 	anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
 	spin_lock(&anon_vma->lock);
+	return anon_vma;
 out:
 	rcu_read_unlock();
-	return anon_vma;
+	return NULL;
+}
+
+static void page_unlock_anon_vma(struct anon_vma *anon_vma)
+{
+	spin_unlock(&anon_vma->lock);
+	rcu_read_unlock();
 }
 
 /*
@@ -333,7 +340,8 @@ static int page_referenced_anon(struct page *page)
 		if (!mapcount)
 			break;
 	}
-	spin_unlock(&anon_vma->lock);
+
+	page_unlock_anon_vma(anon_vma);
 	return referenced;
 }
 
@@ -802,7 +810,8 @@ static int try_to_unmap_anon(struct page *page, int migration)
 		if (ret == SWAP_FAIL || !page_mapped(page))
 			break;
 	}
-	spin_unlock(&anon_vma->lock);
+
+	page_unlock_anon_vma(anon_vma);
 	return ret;
 }