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mm/mremap: use vmi version of vma_merge() 

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

Link: https://lkml.kernel.org/r/20230120162650.984577-27-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-01-20 11:26:27 -05:00 committed by Andrew Morton
parent 076f16bf76
commit a27a11f92f
1 changed files with 7 additions and 4 deletions
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11
mm/mremap.c
View File

@ -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;