mm: call arch_swap_restore() from unuse_pte()

We would like to move away from requiring architectures to restore
metadata from swap in the set_pte_at() implementation, as this is not only
error-prone but adds complexity to the arch-specific code.  This requires
us to call arch_swap_restore() before calling swap_free() whenever pages
are restored from swap.  We are currently doing so everywhere except in
unuse_pte(); do so there as well.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://linux-review.googlesource.com/id/I68276653e612d64cde271ce1b5a99ae05d6bbc4f
Signed-off-by: Peter Collingbourne <[email protected]>
Suggested-by: David Hildenbrand <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: "Huang, Ying" <[email protected]>
Reviewed-by: Steven Price <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Cc: Alexandru Elisei <[email protected]>
Cc: Chinwen Chang <[email protected]>
Cc: Evgenii Stepanov <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: kasan-dev <[email protected]>
Cc: "Kuan-Ying Lee (李冠穎)" <[email protected]>
Cc: Qun-Wei Lin <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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