+#ifdef CONFIG_MEMORY_FAILURE
+/*
+ * Error injection support for memory error handling.
+ */
+static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ for (; start < end; start += PAGE_SIZE) {
+ struct page *p;
+ int ret = get_user_pages_fast(start, 1, 0, &p);
+ if (ret != 1)
+ return ret;
+ if (bhv == MADV_SOFT_OFFLINE) {
+ printk(KERN_INFO "Soft offlining page %lx at %lx\n",
+ page_to_pfn(p), start);
+ ret = soft_offline_page(p, MF_COUNT_INCREASED);
+ if (ret)
+ break;
+ continue;
+ }
+ printk(KERN_INFO "Injecting memory failure for page %lx at %lx\n",
+ page_to_pfn(p), start);
+ /* Ignore return value for now */
+ __memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED);
+ }
+ return ret;
+}
+#endif
+