UKSM: Fix kvm missing "uksm_zero_pfn"

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Merge branch 'uksm_stable' into uksm_cleanups
UKSM: Cleanups

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanups

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup page_hash_max()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup check_collision()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup page_trans_compound_anon_split()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup try_to_merge_with_uksm_page()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup restore_uksm_page_pte()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanups try_to_merge_two_pages()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup hash_cmp()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanups

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup stable_subtree_insert()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanups

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup page_hash()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
UKSM: Cleanup write_protect_page()

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>