mm/openrisc: prepare for removing num_physpages and simplify mem_init()

/* References to section boundaries */

static int __init free_pages_init(void)

{

	int reservedpages, pfn;

	/* this will put all low memory onto the freelists */

	free_all_bootmem();

	reservedpages = 0;

	for (pfn = 0; pfn < max_low_pfn; pfn++) {

		/*

		 * Only count reserved RAM pages

		 */

		if (PageReserved(mem_map + pfn))

			reservedpages++;

	}

	return reservedpages;

}

static void __init set_max_mapnr_init(void)

{

	max_mapnr = num_physpages = max_low_pfn;

}

void __init mem_init(void)

{

	int codesize, reservedpages, datasize, initsize;

	BUG_ON(!mem_map);

	set_max_mapnr_init();

	max_mapnr = max_low_pfn;

	high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);

	/* clear the zero-page */

	memset((void *)empty_zero_page, 0, PAGE_SIZE);

	reservedpages = free_pages_init();

	codesize = (unsigned long)&_etext - (unsigned long)&_stext;

	datasize = (unsigned long)&_edata - (unsigned long)&_etext;

	initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;

	/* this will put all low memory onto the freelists */

	free_all_bootmem();

	printk(KERN_INFO

	       "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",

	       (unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),

	       max_mapnr << (PAGE_SHIFT - 10), codesize >> 10,

	       reservedpages << (PAGE_SHIFT - 10), datasize >> 10,

	       initsize >> 10, (unsigned long)(0 << (PAGE_SHIFT - 10))

	    );

	mem_init_print_info(NULL);

	printk("mem_init_done ...........................................\n");

	mem_init_done = 1;