From: Miaohe Lin <linmiaohe@huawei.com>
Date: Tue, 22 Mar 2022 21:46:41 +0000 (-0700)
Subject: mm/madvise: use vma_lookup() instead of find_vma()
X-Git-Tag: v6.1-rc5~1778^2~66
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=531037a06518094aba283194aa0d4808b0c47656;p=platform%2Fkernel%2Flinux-starfive.git

mm/madvise: use vma_lookup() instead of find_vma()

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

Link: https://lkml.kernel.org/r/20220311082731.63513-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/madvise.c b/mm/madvise.c
index 7b5d6fc..2efcde2 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -849,8 +849,8 @@ static long madvise_populate(struct vm_area_struct *vma,
 		 * our VMA might have been split.
 		 */
 		if (!vma || start >= vma->vm_end) {
-			vma = find_vma(mm, start);
-			if (!vma || start < vma->vm_start)
+			vma = vma_lookup(mm, start);
+			if (!vma)
 				return -ENOMEM;
 		}