From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Wed, 9 Nov 2022 16:30:19 +0000 (-0500)
Subject: mmap: Convert vma_expand() to use vma iterator
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dda4a6334a9c3b4f4492e50e8ce26225f8c288a0;p=users%2Fjedix%2Flinux-maple.git

mmap: Convert vma_expand() to use vma iterator

Use the vma iterator instead of the maple state for type safety and for
consistency through the mm code.

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

diff --git a/mm/mmap.c b/mm/mmap.c
index 6f71b4e5e3ad..15464fc19233 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -586,7 +586,7 @@ static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma)
  *
  * Returns: 0 on success
  */
-inline int vma_expand(struct ma_state *mas, struct vm_area_struct *vma,
+inline int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
 		      unsigned long start, unsigned long end, pgoff_t pgoff,
 		      struct vm_area_struct *next)
 {
@@ -615,7 +615,7 @@ inline int vma_expand(struct ma_state *mas, struct vm_area_struct *vma,
 	/* Only handles expanding */
 	VM_BUG_ON(vma->vm_start < start || vma->vm_end > end);
 
-	if (mas_preallocate(mas, vma, GFP_KERNEL))
+	if (vma_iter_prealloc(vmi, vma))
 		goto nomem;
 
 	vma_adjust_trans_huge(vma, start, end, 0);
@@ -640,8 +640,7 @@ inline int vma_expand(struct ma_state *mas, struct vm_area_struct *vma,
 	vma->vm_start = start;
 	vma->vm_end = end;
 	vma->vm_pgoff = pgoff;
-	/* Note: mas must be pointing to the expanding VMA */
-	vma_mas_store(vma, mas);
+	vma_iter_store(vmi, vma);
 
 	if (file) {
 		vma_interval_tree_insert(vma, root);
@@ -2655,7 +2654,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 
 	/* Actually expand, if possible */
 	if (vma &&
-	    !vma_expand(&vmi.mas, vma, merge_start, merge_end, vm_pgoff, next)) {
+	    !vma_expand(&vmi, vma, merge_start, merge_end, vm_pgoff, next)) {
 		khugepaged_enter_vma(vma, vm_flags);
 		goto expanded;
 	}