Check for errors & small cleanups in acpi

@@ -480,6 +481,8 @@
 	panic("S3 and PAE do not like each other for now.");
 	return 1;
 #endif
+	if (!acpi_wakeup_address)
+		return 1;
 	init_low_mapping(swapper_pg_dir, USER_PTRS_PER_PGD);
 	memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end - &wakeup_start);
 	acpi_copy_wakeup_routine(acpi_wakeup_address);

@@ -507,7 +501,7 @@
 /**
  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
  *
- * We allocate a page in low memory for the wakeup
+ * We allocate a page in 1MB low memory for the wakeup
  * routine for when we come back from a sleep state. The
  * runtime allocator allows specification of <16M pages, but not
  * <1M pages.

@@ -515,9 +509,10 @@
 void __init acpi_reserve_bootmem(void)
 {
 	acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
+	if (!acpi_wakeup_address)
+		printk(KERN_ERR "ACPI: Cannot allocate lowmem. S3 disabled.\n");
 	if ((&wakeup_end - &wakeup_start) > PAGE_SIZE)
 		printk(KERN_CRIT "ACPI: Wakeup code way too big, will crash on attempt to suspend\n");
-	printk(KERN_DEBUG "ACPI: have wakeup address 0x%8.8lx\n", acpi_wakeup_address);
 }
 
 #endif /*CONFIG_ACPI_SLEEP*/