[PATCH 3/3 -next] xen: fix build when SYSRQ is disabled

[Randy Dunlap <randy.dunlap@oracle.com>]

From: Randy Dunlap <randy.dunlap@oracle.com>

Fix build error when CONFIG_MAGIC_SYSRQ is not enabled:

drivers/xen/manage.c:223: error: implicit declaration of function 'handle_sysrq'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Chris Wright <chrisw@sous-sol.org>
---
 drivers/xen/manage.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- linux-next-20100325.orig/drivers/xen/manage.c
+++ linux-next-20100325/drivers/xen/manage.c
@@ -194,6 +194,7 @@ static void shutdown_handler(struct xenb
 	kfree(str);
 }
 
+#ifdef CONFIG_MAGIC_SYSRQ
 static void sysrq_handler(struct xenbus_watch *watch, const char **vec,
 			  unsigned int len)
 {
@@ -223,15 +224,16 @@ static void sysrq_handler(struct xenbus_
 		handle_sysrq(sysrq_key, NULL);
 }
 
-static struct xenbus_watch shutdown_watch = {
-	.node = "control/shutdown",
-	.callback = shutdown_handler
-};
-
 static struct xenbus_watch sysrq_watch = {
 	.node = "control/sysrq",
 	.callback = sysrq_handler
 };
+#endif
+
+static struct xenbus_watch shutdown_watch = {
+	.node = "control/shutdown",
+	.callback = shutdown_handler
+};
 
 static int setup_shutdown_watcher(void)
 {
@@ -243,11 +245,13 @@ static int setup_shutdown_watcher(void)
 		return err;
 	}
 
+#ifdef CONFIG_MAGIC_SYSRQ
 	err = register_xenbus_watch(&sysrq_watch);
 	if (err) {
 		printk(KERN_ERR "Failed to set sysrq watcher\n");
 		return err;
 	}
+#endif
 
 	return 0;
 }