linux-kernel - [PATCH] mm/mlock: Use vma_lookup() instead of find

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Date:   Mon, 14 Mar 2022 23:17:28 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <hughd@...gle.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm/mlock: Use vma_lookup() instead of find_vma()

Using vma_lookup() verifies the start is contained in the found vma. This
results in easier to read the code.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/mlock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mlock.c b/mm/mlock.c
index efd2dd2943de..fefa9644d0f9 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -453,8 +453,8 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
 		return -EINVAL;
 	if (end == start)
 		return 0;
-	vma = find_vma(current->mm, start);
-	if (!vma || vma->vm_start > start)
+	vma = vma_lookup(current->mm, start);
+	if (!vma)
 		return -ENOMEM;
 
 	prev = vma->vm_prev;
-- 
2.23.0