ftrace: disable tracing for hibernation

In accordance with commit f42ac38c59e0a03d6da0c24a63fb211393f484b0
("ftrace: disable tracing for suspend to ram"), disable tracing
around the suspend code in hibernation code paths.

Signed-off-by: Rafael J. Wysocki <[e-mail]>
Acked-by: Steven Rostedt <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/power/disk.c

···
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
+#include <linux/ftrace.h>
 
 #include "power.h"
 
···
 
 int hibernation_snapshot(int platform_mode)
 {
-	int error;
+	int error, ftrace_save;
 
 	/* Free memory before shutting down devices. */
 	error = swsusp_shrink_memory();
···
 		goto Close;
 
 	suspend_console();
+	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_FREEZE);
 	if (error)
 		goto Recover_platform;
···
  Resume_devices:
 	device_resume(in_suspend ?
 		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
  Close:
 	platform_end(platform_mode);
···
 
 int hibernation_restore(int platform_mode)
 {
-	int error;
+	int error, ftrace_save;
 
 	pm_prepare_console();
 	suspend_console();
+	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_QUIESCE);
 	if (error)
 		goto Finish;
···
 	platform_restore_cleanup(platform_mode);
 	device_resume(PMSG_RECOVER);
  Finish:
+	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
 	pm_restore_console();
 	return error;
···
 
 int hibernation_platform_enter(void)
 {
-	int error;
+	int error, ftrace_save;
 
 	if (!hibernation_ops)
 		return -ENOSYS;
···
 		goto Close;
 
 	suspend_console();
+	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_HIBERNATE);
 	if (error) {
 		if (hibernation_ops->recover)
···
 	hibernation_ops->finish();
  Resume_devices:
 	device_resume(PMSG_RESTORE);
+	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
  Close:
 	hibernation_ops->end();