mm: fix failure to unmap pte on highmem systems

The loser of a race to service a pte for a device private entry in the
swap path previously unlocked the ptl, but failed to unmap the pte.  This
only affects highmem systems since unmapping a pte is a noop on
non-highmem systems.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 16ce101db85d ("mm/memory.c: fix race when faulting a device private page")
Signed-off-by: Ryan Roberts <[email protected]>
Reviewed-by: Zi Yan <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: SeongJae Park <[email protected]>
Cc: Uladzislau Rezki (Sony) <[email protected]>
Cc: Yu Zhao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions