linux-kernel - [PATCH 4/4] mm/rmap.c: move anon_vma initialization code into anon_vma

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Message-Id: <1383292467-28922-5-git-send-email-yuanhan.liu@linux.intel.com>
Date:	Fri,  1 Nov 2013 15:54:27 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michel Lespinasse <walken@...gle.com>
Subject: [PATCH 4/4] mm/rmap.c: move anon_vma initialization code into anon_vma_ctor

Cc: Ingo Molnar <mingo@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Michel Lespinasse <walken@...gle.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@...ux.intel.com>
---
 mm/rmap.c |   23 +++++++++--------------
 1 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 246b5fe..831dd4e 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -67,19 +67,7 @@ static struct kmem_cache *anon_vma_chain_cachep;
 
 static inline struct anon_vma *anon_vma_alloc(void)
 {
-	struct anon_vma *anon_vma;
-
-	anon_vma = kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL);
-	if (anon_vma) {
-		atomic_set(&anon_vma->refcount, 1);
-		/*
-		 * Initialise the anon_vma root to point to itself. If called
-		 * from fork, the root will be reset to the parents anon_vma.
-		 */
-		anon_vma->root = anon_vma;
-	}
-
-	return anon_vma;
+	return kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL);
 }
 
 static inline void anon_vma_free(struct anon_vma *anon_vma)
@@ -293,8 +281,15 @@ static void anon_vma_ctor(void *data)
 	struct anon_vma *anon_vma = data;
 
 	rwlock_init(&anon_vma->rwlock);
-	atomic_set(&anon_vma->refcount, 0);
 	anon_vma->rb_root = RB_ROOT;
+
+	atomic_set(&anon_vma->refcount, 1);
+	/*
+	 * Initialise the anon_vma root to point to itself. If called
+	 * from fork, the root will be reset to the parents anon_vma.
+	 */
+	anon_vma->root = anon_vma;
+
 }
 
 void __init anon_vma_init(void)
-- 
1.7.7.6

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