xen: Convert printks to pr_<level>

Convert printks to pr_<level> (excludes printk(KERN_DEBUG...)
to be more consistent throughout the xen subsystem.

Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME
Coalesce formats and add missing word spaces
Add missing newlines
Align arguments and reflow to 80 columns
Remove DRV_NAME from formats as pr_fmt adds the same content

This does change some of the prefixes of these messages
but it also does make them more consistent.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
index 084041d4..cc6513a 100644
--- a/drivers/xen/cpu_hotplug.c
+++ b/drivers/xen/cpu_hotplug.c
@@ -1,3 +1,5 @@
+#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
+
 #include <linux/notifier.h>
 
 #include <xen/xen.h>
@@ -31,7 +33,7 @@
 	err = xenbus_scanf(XBT_NIL, dir, "availability", "%15s", state);
 	if (err != 1) {
 		if (!xen_initial_domain())
-			printk(KERN_ERR "XENBUS: Unable to read cpu state\n");
+			pr_err("Unable to read cpu state\n");
 		return err;
 	}
 
@@ -40,7 +42,7 @@
 	else if (strcmp(state, "offline") == 0)
 		return 0;
 
-	printk(KERN_ERR "XENBUS: unknown state(%s) on CPU%d\n", state, cpu);
+	pr_err("unknown state(%s) on CPU%d\n", state, cpu);
 	return -EINVAL;
 }
 static void vcpu_hotplug(unsigned int cpu)