+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+/* calculate vmemmap's address from given system ram pfn and register it */
+int get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
+{
+ unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT;
+ unsigned long nr_pages = ent->size >> PAGE_SHIFT;
+ unsigned long start, end;
+ struct kcore_list *vmm, *tmp;
+
+
+ start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK;
+ end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1;
+ end = ALIGN(end, PAGE_SIZE);
+ /* overlap check (because we have to align page */
+ list_for_each_entry(tmp, head, list) {
+ if (tmp->type != KCORE_VMEMMAP)
+ continue;
+ if (start < tmp->addr + tmp->size)
+ if (end > tmp->addr)
+ end = tmp->addr;
+ }
+ if (start < end) {
+ vmm = kmalloc(sizeof(*vmm), GFP_KERNEL);
+ if (!vmm)
+ return 0;
+ vmm->addr = start;
+ vmm->size = end - start;
+ vmm->type = KCORE_VMEMMAP;
+ list_add_tail(&vmm->list, head);
+ }
+ return 1;
+
+}
+#else
+int get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
+{
+ return 1;
+}
+
+#endif
+