linux-kernel - [patch] mmap: feed back correct prev vma when finding vma

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Date:	Thu, 9 Aug 2012 20:21:37 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, Hillf Danton <dhillf@...il.com>
Subject: [patch] mmap: feed back correct prev vma when finding vma

After walking rb tree, if vma is determined, prev vma has to be determined
based on vma; and rb_prev should be considered only if no vma determined.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---

--- a/mm/mmap.c	Fri Aug  3 07:38:10 2012
+++ b/mm/mmap.c	Mon Aug  6 20:10:18 2012
@@ -385,9 +385,13 @@ find_vma_prepare(struct mm_struct *mm, u
 		}
 	}

-	*pprev = NULL;
-	if (rb_prev)
-		*pprev = rb_entry(rb_prev, struct vm_area_struct, vm_rb);
+	if (vma) {
+		*pprev = vma->vm_prev;
+	} else {
+		*pprev = NULL;
+		if (rb_prev)
+			*pprev = rb_entry(rb_prev, struct vm_area_struct, vm_rb);
+	}
 	*rb_link = __rb_link;
 	*rb_parent = __rb_parent;
 	return vma;
--
--
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