diff options
author | Miaohe Lin <linmiaohe@huawei.com> | 2021-05-04 18:37:10 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-19 10:56:30 +0200 |
commit | f1183744e8d0dab17d73913804af8158fa0d4d56 (patch) | |
tree | da73e7b5939cb2868a1dc3a4a8df43c785f0a155 /mm | |
parent | ed98b887d31c2f83db133bcb7b88b46fbb9af845 (diff) |
mm/migrate.c: fix potential indeterminate pte entry in migrate_vma_insert_page()
[ Upstream commit 34f5e9b9d1990d286199084efa752530ee3d8297 ]
If the zone device page does not belong to un-addressable device memory,
the variable entry will be uninitialized and lead to indeterminate pte
entry ultimately. Fix this unexpected case and warn about it.
Link: https://lkml.kernel.org/r/20210325131524.48181-4-linmiaohe@huawei.com
Fixes: df6ad69838fc ("mm/device-public-memory: device memory cache coherent with CPU")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/migrate.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 62b81d5257aa..773622cffe77 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2973,6 +2973,13 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, swp_entry = make_device_private_entry(page, vma->vm_flags & VM_WRITE); entry = swp_entry_to_pte(swp_entry); + } else { + /* + * For now we only support migrating to un-addressable + * device memory. + */ + pr_warn_once("Unsupported ZONE_DEVICE page type.\n"); + goto abort; } } else { entry = mk_pte(page, vma->vm_page_prot); |