linux-kernel - [PATCH] mm/mlock: remove unneeded start >= vma->vm

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Date:   Mon, 14 Mar 2022 23:32:23 +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: remove unneeded start >= vma->vm_end check

If find_vma returns a vma, it must satisfies that start < vma->vm_end.
Since vma list is sorted in the ascending order, so we will never see
start >= vma->vm_end here. Remove this unneeded check.

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

diff --git a/mm/mlock.c b/mm/mlock.c
index fefa9644d0f9..fe278634ebe3 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -509,8 +509,6 @@ static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
 		return 0;
 
 	for (; vma ; vma = vma->vm_next) {
-		if (start >= vma->vm_end)
-			continue;
 		if (start + len <=  vma->vm_start)
 			break;
 		if (vma->vm_flags & VM_LOCKED) {
-- 
2.23.0