[PATCH v4 2/4] mm/migrate_device.c: Add missing flush_cache_page()

[Alistair Popple]

Currently we only call flush_cache_page() for the anon_exclusive case,
however in both cases we clear the pte so should flush the cache.

Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Fixes: 8c3328f1f36a ("mm/migrate: migrate_vma() unmap page from vma while collecting pages")
Cc: stable@xxxxxxxxxxxxxxx

---

New for v4
---
 mm/migrate_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 6a5ef9f..4cc849c 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -193,9 +193,9 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
 			bool anon_exclusive;
 			pte_t swp_pte;
 
+			flush_cache_page(vma, addr, pte_pfn(*ptep));
 			anon_exclusive = PageAnon(page) && PageAnonExclusive(page);
 			if (anon_exclusive) {
-				flush_cache_page(vma, addr, pte_pfn(*ptep));
 				ptep_clear_flush(vma, addr, ptep);
 
 				if (page_try_share_anon_rmap(page)) {
-- 
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