mm/migrate_device.c: add missing flush_cache_page()

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.

Link: https://lkml.kernel.org/r/5676f30436ab71d1a587ac73f835ed8bd2113ff5.1662078528.git-series.apopple@nvidia.com
Fixes: 8c3328f1f36a ("mm/migrate: migrate_vma() unmap page from vma while collecting pages")
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: Alex Sierra <alex.sierra@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: huang ying <huang.ying.caritas@gmail.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Karol Herbst <kherbst@redhat.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 6a5ef9f0da6a2ffaf19f21c10edfd9d1f9863bd7..4cc849c3b54c37243def7bd6a06607510aa40798 100644 (file)
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -193,9 +193,9 @@ again:
                        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)) {