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Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c23
1 files changed, 6 insertions, 17 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 411a85682b58..b11ce6c92099 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -623,6 +623,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
return -ENOMEM;
}
+ vma_start_write(vma);
new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT);
new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff,
&need_rmap_locks);
@@ -683,7 +684,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
/* Tell pfnmap has moved from this vma */
if (unlikely(vma->vm_flags & VM_PFNMAP))
- untrack_pfn_moved(vma);
+ untrack_pfn_clear(vma);
if (unlikely(!err && (flags & MREMAP_DONTUNMAP))) {
/* We always clear VM_LOCKED[ONFAULT] on the old vma */
@@ -1040,23 +1041,11 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
* vma (expand operation itself) and possibly also with
* the next vma if it becomes adjacent to the expanded
* vma and otherwise compatible.
- *
- * However, vma_merge() can currently fail due to
- * is_mergeable_vma() check for vm_ops->close (see the
- * comment there). Yet this should not prevent vma
- * expanding, so perform a simple expand for such vma.
- * Ideally the check for close op should be only done
- * when a vma would be actually removed due to a merge.
*/
- if (!vma->vm_ops || !vma->vm_ops->close) {
- vma = 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_expand(&vmi, vma, vma->vm_start,
- addr + new_len, vma->vm_pgoff, NULL)) {
- vma = NULL;
- }
+ vma = 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));
if (!vma) {
vm_unacct_memory(pages);
ret = -ENOMEM;