[PATCH AUTOSEL for 4.9 257/293] mm/mempolicy: fix the check of nodemask from user

From: Yisheng Xie [ Upstream commit 56521e7a02b7b84a5e72691a1fb15570e6055545 ] As Xiaojun reported the ltp of migrate_pages01 will fail on arm64 system which has 4 nodes[0...3], all have memory and CONFIG_NODES_SHIFT=2: migrate_pages010 TINFO :

[PATCH AUTOSEL for 4.9 257/293] mm/mempolicy: fix the check of nodemask from user

From: Yisheng Xie [ Upstream commit 56521e7a02b7b84a5e72691a1fb15570e6055545 ] As Xiaojun reported the ltp of migrate_pages01 will fail on arm64 system which has 4 nodes[0...3], all have memory and CONFIG_NODES_SHIFT=2: migrate_pages010 TINFO : test_invalid_nodes migrate_pages01