powerpc/fadump: Reserve memory at an offset closer to bottom of RAM

		pr_debug("fadumphdr_addr = %p\n",

				(void *) fw_dump.fadumphdr_addr);

	} else {

		/* Reserve the memory at the top of memory. */

		size = get_fadump_area_size();

		base = memory_boundary - size;

		memblock_reserve(base, size);

		printk(KERN_INFO "Reserved %ldMB of memory at %ldMB "

				"for firmware-assisted dump\n",

		/*

		 * Reserve memory at an offset closer to bottom of the RAM to

		 * minimize the impact of memory hot-remove operation. We can't

		 * use memblock_find_in_range() here since it doesn't allocate

		 * from bottom to top.

		 */

		for (base = fw_dump.boot_memory_size;

		     base <= (memory_boundary - size);

		     base += size) {

			if (memblock_is_region_memory(base, size) &&

			    !memblock_is_region_reserved(base, size))

				break;

		}

		if ((base > (memory_boundary - size)) ||

		    memblock_reserve(base, size)) {

			pr_err("Failed to reserve memory\n");

			return 0;

		}

		pr_info("Reserved %ldMB of memory at %ldMB for firmware-"

			"assisted dump (System RAM: %ldMB)\n",

			(unsigned long)(size >> 20),

				(unsigned long)(base >> 20));

			(unsigned long)(base >> 20),

			(unsigned long)(memblock_phys_mem_size() >> 20));

	}

	fw_dump.reserve_dump_area_start = base;

	fw_dump.reserve_dump_area_size = size;

	return 1;