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 <rjw@sisk.pl>
Acked-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index f011e0870b52b316032295bc9b6ffcc45a4358ea..bbd85c60f7419f5fca1cbf1d0b5d6e6aad37f625 100644 (file)
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -21,6 +21,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
+#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -255,7 +256,7 @@ static int create_image(int platform_mode)
 
 int hibernation_snapshot(int platform_mode)
 {
-       int error;
+       int error, ftrace_save;
 
        /* Free memory before shutting down devices. */
        error = swsusp_shrink_memory();
@@ -267,6 +268,7 @@ int hibernation_snapshot(int platform_mode)
                goto Close;
 
        suspend_console();
+       ftrace_save = __ftrace_enabled_save();
        error = device_suspend(PMSG_FREEZE);
        if (error)
                goto Recover_platform;
@@ -296,6 +298,7 @@ int hibernation_snapshot(int platform_mode)
  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);
@@ -366,10 +369,11 @@ static int resume_target_kernel(void)
 
 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;
@@ -384,6 +388,7 @@ int hibernation_restore(int platform_mode)
        platform_restore_cleanup(platform_mode);
        device_resume(PMSG_RECOVER);
  Finish:
+       __ftrace_enabled_restore(ftrace_save);
        resume_console();
        pm_restore_console();
        return error;
@@ -396,7 +401,7 @@ int hibernation_restore(int platform_mode)
 
 int hibernation_platform_enter(void)
 {
-       int error;
+       int error, ftrace_save;
 
        if (!hibernation_ops)
                return -ENOSYS;
@@ -411,6 +416,7 @@ int hibernation_platform_enter(void)
                goto Close;
 
        suspend_console();
+       ftrace_save = __ftrace_enabled_save();
        error = device_suspend(PMSG_HIBERNATE);
        if (error) {
                if (hibernation_ops->recover)
@@ -445,6 +451,7 @@ int hibernation_platform_enter(void)
        hibernation_ops->finish();
  Resume_devices:
        device_resume(PMSG_RESTORE);
+       __ftrace_enabled_restore(ftrace_save);
        resume_console();
  Close:
        hibernation_ops->end();