From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Mon, 4 Jan 2021 20:03:49 +0000 (-0500)
Subject: mm/mremap: Use vma_next() instead of vma linked list
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=417a28b28dbce6addf8be2d3dbc2f81c9401fec7;p=users%2Fwilly%2Flinux.git

mm/mremap: Use vma_next() instead of vma linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/mm/mremap.c b/mm/mremap.c
index 160ec0d05465..bcfdabab4ab9 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -701,7 +701,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
 	if (excess) {
 		vma->vm_flags |= VM_ACCOUNT;
 		if (split)
-			vma->vm_next->vm_flags |= VM_ACCOUNT;
+			vma_next(mm, vma)->vm_flags |= VM_ACCOUNT;
 	}
 
 	return new_addr;
@@ -875,9 +875,11 @@ out:
 static int vma_expandable(struct vm_area_struct *vma, unsigned long delta)
 {
 	unsigned long end = vma->vm_end + delta;
+	struct vm_area_struct *next;
 	if (end < vma->vm_end) /* overflow */
 		return 0;
-	if (vma->vm_next && vma->vm_next->vm_start < end) /* intersection */
+	next = vma_next(vma->vm_mm, vma);
+	if (next && next->vm_start < end) /* intersection */
 		return 0;
 	if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start,
 			      0, MAP_FIXED) & ~PAGE_MASK)