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-rw-r--r--kernel/compat.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index d4898aad6cfa..6952dd057300 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -982,4 +982,37 @@ asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
982 } 982 }
983 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 983 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
984} 984}
985
986asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
987 compat_ulong_t maxnode,
988 const compat_ulong_t __user *old_nodes,
989 const compat_ulong_t __user *new_nodes)
990{
991 unsigned long __user *old = NULL;
992 unsigned long __user *new = NULL;
993 nodemask_t tmp_mask;
994 unsigned long nr_bits;
995 unsigned long size;
996
997 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
998 size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
999 if (old_nodes) {
1000 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
1001 return -EFAULT;
1002 old = compat_alloc_user_space(new_nodes ? size * 2 : size);
1003 if (new_nodes)
1004 new = old + size / sizeof(unsigned long);
1005 if (copy_to_user(old, nodes_addr(tmp_mask), size))
1006 return -EFAULT;
1007 }
1008 if (new_nodes) {
1009 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
1010 return -EFAULT;
1011 if (new == NULL)
1012 new = compat_alloc_user_space(size);
1013 if (copy_to_user(new, nodes_addr(tmp_mask), size))
1014 return -EFAULT;
1015 }
1016 return sys_migrate_pages(pid, nr_bits + 1, old, new);
1017}
985#endif 1018#endif