[PATCH] run page_address_init() earlier

If someone runs page_address() before page_address_init(), the kernel locks
up over uninitialised spinlocks.

This only happens with the 4:4 patch, but it is more robust to run
page_address_init() before setup_arch().  page_address_init() simply
initialises statically allocated storage.

init/main.c

@@ -409,6 +409,7 @@ asmlinkage void __init start_kernel(void)
  * enable them
  */
 	lock_kernel();
+	page_address_init();
 	printk(linux_banner);
 	setup_arch(&command_line);
 	setup_per_cpu_areas();
@@ -452,7 +453,6 @@ asmlinkage void __init start_kernel(void)
 		initrd_start = 0;
 	}
 #endif
-	page_address_init();
 	mem_init();
 	kmem_cache_init();
 	if (late_time_init)