[to-be-updated] mm-hmm-fix-bad-subpage-pointer-in-try_to_unmap_one.patch removed from -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: mm/hmm: fix bad subpage pointer in try_to_unmap_one
has been removed from the -mm tree.  Its filename was
     mm-hmm-fix-bad-subpage-pointer-in-try_to_unmap_one.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Ralph Campbell <rcampbell@nvidia.com>
Subject: mm/hmm: fix bad subpage pointer in try_to_unmap_one

When migrating a ZONE device private page from device memory to system
memory, the subpage pointer is initialized from a swap pte which computes
an invalid page pointer. A kernel panic results such as:

BUG: unable to handle page fault for address: ffffea1fffffffc8

Initialize subpage correctly before calling page_remove_rmap().

Link: http://lkml.kernel.org/r/20190709223556.28908-1-rcampbell@nvidia.com
Fixes: a5430dda8a3a1c ("mm/migrate: support un-addressable ZONE_DEVICE page in migration")
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/rmap.c |    1 +
 1 file changed, 1 insertion(+)

--- a/mm/rmap.c~mm-hmm-fix-bad-subpage-pointer-in-try_to_unmap_one
+++ a/mm/rmap.c
@@ -1476,6 +1476,7 @@ static bool try_to_unmap_one(struct page
 			 * No need to invalidate here it will synchronize on
 			 * against the special swap migration pte.
 			 */
+			subpage = page;
 			goto discard;
 		}
 
_

Patches currently in -mm which might be from rcampbell@nvidia.com are