linux-kernel - [RFC] mm: change find

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Date:	Mon, 14 Dec 2015 19:02:25 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	oleg@...hat.com, gang.chen.5i5j@...il.com, mhocko@...e.com,
	kwapulinski.piotr@...il.com, aarcange@...hat.com,
	dcashman@...gle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	yalin wang <yalin.wang2010@...il.com>
Subject: [RFC] mm: change find_vma() function

change find_vma() to break ealier when found the adderss
is not in any vma, don't need loop to search all vma.

Signed-off-by: yalin wang <yalin.wang2010@...il.com>
---
 mm/mmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/mmap.c b/mm/mmap.c
index b513f20..8294c9b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2064,6 +2064,9 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 			vma = tmp;
 			if (tmp->vm_start <= addr)
 				break;
+			if (!tmp->vm_prev || tmp->vm_prev->vm_end <= addr)
+				break;
+
 			rb_node = rb_node->rb_left;
 		} else
 			rb_node = rb_node->rb_right;
-- 
1.9.1

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