__mt_dup
int __mt_dup(struct maple_tree *mt, struct maple_tree *new, gfp_t gfp);
EXPORT_SYMBOL(__mt_dup);
ret = __mt_dup(&mt, &newmt, GFP_KERNEL);
ret = __mt_dup(&mt, &newmt, GFP_KERNEL);
retval = __mt_dup(&oldmm->mm_mt, &mm->mm_mt, GFP_KERNEL);