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-rw-r--r--mm/rmap.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index af775855e58f..6781f693df50 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1574,11 +1574,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
pteval = huge_ptep_clear_flush(vma, address, pvmw.pte);
} else {
flush_cache_page(vma, address, pte_pfn(*pvmw.pte));
- /*
- * Nuke the page table entry. When having to clear
- * PageAnonExclusive(), we always have to flush.
- */
- if (should_defer_flush(mm, flags) && !anon_exclusive) {
+ /* Nuke the page table entry. */
+ if (should_defer_flush(mm, flags)) {
/*
* We clear the PTE but do not flush so potentially
* a remote CPU could still be writing to the folio.
@@ -1709,6 +1706,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
page_vma_mapped_walk_done(&pvmw);
break;
}
+
+ /* See page_try_share_anon_rmap(): clear PTE first. */
if (anon_exclusive &&
page_try_share_anon_rmap(subpage)) {
swap_free(entry);
@@ -2040,6 +2039,8 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
}
VM_BUG_ON_PAGE(pte_write(pteval) && folio_test_anon(folio) &&
!anon_exclusive, subpage);
+
+ /* See page_try_share_anon_rmap(): clear PTE first. */
if (anon_exclusive &&
page_try_share_anon_rmap(subpage)) {
if (folio_test_hugetlb(folio))