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

Prepare for removing num_physpages and simplify mem_init().
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/kernel/mem.c

@@ -70,10 +70,8 @@ void __init mem_init(void)
 #ifdef CONFIG_HIGHMEM
 	setup_highmem(end_iomem, highmem);
 #endif
-	num_physpages = totalram_pages;
 	max_pfn = totalram_pages;
-	printk(KERN_INFO "Memory: %luk available\n",
-	       nr_free_pages() << (PAGE_SHIFT-10));
+	mem_init_print_info(NULL);
 	kmalloc_ok = 1;
 }