ACPI: nvs: Unify the message printing

The message printing in nvs.c is mixed with pr_*() and
printk(), but with no prefix and also no pr_fmt() defined.

Introduce pr_fmt() and use pr_*() macros to replace printk(),
to generate a unified format string for prefix.
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/nvs.c

@@ -5,6 +5,8 @@
  * Copyright (C) 2008-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
  */
 
+#define pr_fmt(fmt) "ACPI: PM: " fmt
+
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
@@ -94,7 +96,7 @@ static int suspend_nvs_register(unsigned long start, unsigned long size)
 {
 	struct nvs_page *entry, *next;
 
-	pr_info("PM: Registering ACPI NVS region [mem %#010lx-%#010lx] (%ld bytes)\n",
+	pr_info("Registering ACPI NVS region [mem %#010lx-%#010lx] (%ld bytes)\n",
 		start, start + size - 1, size);
 
 	while (size > 0) {
@@ -170,7 +172,7 @@ int suspend_nvs_save(void)
 {
 	struct nvs_page *entry;
 
-	printk(KERN_INFO "PM: Saving platform NVS memory\n");
+	pr_info("Saving platform NVS memory\n");
 
 	list_for_each_entry(entry, &nvs_list, node)
 		if (entry->data) {
@@ -202,7 +204,7 @@ void suspend_nvs_restore(void)
 {
 	struct nvs_page *entry;
 
-	printk(KERN_INFO "PM: Restoring platform NVS memory\n");
+	pr_info("Restoring platform NVS memory\n");
 
 	list_for_each_entry(entry, &nvs_list, node)
 		if (entry->data)