linux-kernel - [PATCH v4 26/49] mm/mremap: Use vmi version of vma

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Message-Id: <20230120162650.984577-27-Liam.Howlett@oracle.com>
Date:   Fri, 20 Jan 2023 11:26:27 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        maple-tree@...ts.infradead.org
Cc:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v4 26/49] mm/mremap: Use vmi version of vma_merge()

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Use the vma iterator so that the iterator can be invalidated or updated
to avoid each caller doing so.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/mremap.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index 3cc64c3f8bdb..f161516ab3c1 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -1018,6 +1018,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
 			unsigned long extension_end = addr + new_len;
 			pgoff_t extension_pgoff = vma->vm_pgoff +
 				((extension_start - vma->vm_start) >> PAGE_SHIFT);
+			VMA_ITERATOR(vmi, mm, extension_start);
 
 			if (vma->vm_flags & VM_ACCOUNT) {
 				if (security_vm_enough_memory_mm(mm, pages)) {
@@ -1042,10 +1043,12 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
 			 * when a vma would be actually removed due to a merge.
 			 */
 			if (!vma->vm_ops || !vma->vm_ops->close) {
-				vma = vma_merge(mm, vma, extension_start, extension_end,
-					vma->vm_flags, vma->anon_vma, vma->vm_file,
-					extension_pgoff, vma_policy(vma),
-					vma->vm_userfaultfd_ctx, anon_vma_name(vma));
+				vma = vmi_vma_merge(&vmi, mm, vma,
+				       extension_start, extension_end,
+				       vma->vm_flags, vma->anon_vma,
+				       vma->vm_file, extension_pgoff,
+				       vma_policy(vma), vma->vm_userfaultfd_ctx,
+				       anon_vma_name(vma));
 			} else if (vma_adjust(vma, vma->vm_start, addr + new_len,
 				   vma->vm_pgoff, NULL)) {
 				vma = NULL;
-- 
2.35.1