kexec jump: clean up #ifdef and comments

Move if (kexec_image->preserve_context) { ...  } into #ifdef
CONFIG_KEXEC_JUMP to make code looks cleaner.

Fix no longer correct comments of kernel_kexec().

Signed-off-by: Huang Ying <ying.huang@intel.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kexec.c

@@ -1426,11 +1426,9 @@ static int __init crash_save_vmcoreinfo_init(void)
 
 module_init(crash_save_vmcoreinfo_init)
 
-/**
- *	kernel_kexec - reboot the system
- *
- *	Move into place and start executing a preloaded standalone
- *	executable.  If nothing was preloaded return an error.
+/*
+ * Move into place and start executing a preloaded standalone
+ * executable.  If nothing was preloaded return an error.
  */
 int kernel_kexec(void)
 {
@@ -1443,8 +1441,8 @@ int kernel_kexec(void)
 		goto Unlock;
 	}
 
-	if (kexec_image->preserve_context) {
 #ifdef CONFIG_KEXEC_JUMP
+	if (kexec_image->preserve_context) {
 		mutex_lock(&pm_mutex);
 		pm_prepare_console();
 		error = freeze_processes();
@@ -1471,8 +1469,9 @@ int kernel_kexec(void)
 		if (error)
 			goto Enable_irqs;
 		save_processor_state();
+	} else
 #endif
-	} else {
+	{
 		blocking_notifier_call_chain(&reboot_notifier_list,
 					     SYS_RESTART, NULL);
 		system_state = SYSTEM_RESTART;
@@ -1484,8 +1483,8 @@ int kernel_kexec(void)
 
 	machine_kexec(kexec_image);
 
-	if (kexec_image->preserve_context) {
 #ifdef CONFIG_KEXEC_JUMP
+	if (kexec_image->preserve_context) {
 		restore_processor_state();
 		device_power_up(PMSG_RESTORE);
  Enable_irqs:
@@ -1499,8 +1498,8 @@ int kernel_kexec(void)
  Restore_console:
 		pm_restore_console();
 		mutex_unlock(&pm_mutex);
-#endif
 	}
+#endif
 
  Unlock:
 	if (!xchg(&kexec_lock, 0))