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mm/migrate.c: fix potential indeterminate pte entry in migrate_vma_insert_page()

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[ Upstream commit 34f5e9b9d1 ]

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: df6ad69838 ("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>
This commit is contained in:
Miaohe Lin 2021-05-04 18:37:10 -07:00 committed by Greg Kroah-Hartman
parent 9639a754cc
commit aa0d6d1d3e
1 changed files with 7 additions and 0 deletions
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7
mm/migrate.c
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@ -2914,6 +2914,13 @@ 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);