ksm_madvise
ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
EXPORT_SYMBOL_GPL(ksm_madvise);
error = ksm_madvise(vma, range->start, range->end,
err = ksm_madvise(vma, old_addr, old_addr + old_len,