+#ifdef CONFIG_BLK_DEV_INITRD
+static void __init setup_initrd(void)
+{
+ unsigned long size;
+
+ if (initrd_start >= initrd_end) {
+ pr_err("initrd not found or empty");
+ goto disable;
+ }
+
+ if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ pr_err("initrd extends beyond end of memory");
+ goto disable;
+ }
+
+ size = initrd_end - initrd_start;
+
+ if (memblock_is_region_reserved(__pa(initrd_start), size)) {
+ pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
+ __pa(initrd_start), size);
+ goto disable;
+ }
+
+ memblock_reserve(__pa(initrd_start), size);
+
+ pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
+ (void *)(initrd_start), size);
+
+ initrd_below_start_ok = 1;
+
+ return;
+
+disable:
+ initrd_start = initrd_end = 0;
+
+ pr_err(" - disabling initrd\n");
+}
+#endif
+