If an anonymous vma has not yet been faulted, move_page_tables() in move_vma()
is not necessary for it.
Signed-off-by: Nai Xia <nai.xia@xxxxxxxxx>
---
diff --git a/mm/mremap.c b/mm/mremap.c
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -200,6 +200,10 @@ static unsigned long move_vma(struct vm_area_struct *vma,
if (!new_vma)
return -ENOMEM;
+ /* An anonymous vma has not been faulted, no pagetables lookup. */
+ if (!vma->vm_file && !vma->anon_vma)
+ goto page_tables_ok;
+
moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len);
if (moved_len < old_len) {
/*
@@ -213,6 +217,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
old_addr = new_addr;
new_addr = -ENOMEM;
}
+page_tables_ok:
/* Conceal VM_ACCOUNT so old reservation is not undone */
if (vm_flags & VM_ACCOUNT) {
--
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