tracing: allow tracing of suspend/resume & hibernation code again

Impact: widen function-tracing to suspend+resume (and hibernation) sequences

Now that the ftrace kernel thread is gone, we can allow tracing
during suspend/resume again.

So revert these two commits:

  f42ac38c5 "ftrace: disable tracing for suspend to ram"
  41108eb10 "ftrace: disable tracing for hibernation"

This should be tested very carefully, as it could interact with
altneratives instruction patching, etc.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 4 insertions, 14 deletions

diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index c9d74083746f..f77d3819ef57 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -22,7 +22,6 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
-#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -257,7 +256,7 @@ static int create_image(int platform_mode)
 
 int hibernation_snapshot(int platform_mode)
 {
-        int error, ftrace_save;
+        int error;
 
         /* Free memory before shutting down devices. */
         error = swsusp_shrink_memory();
@@ -269,7 +268,6 @@ 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;
@@ -299,7 +297,6 @@ 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);
@@ -370,11 +367,10 @@ static int resume_target_kernel(void)
 
 int hibernation_restore(int platform_mode)
 {
-        int error, ftrace_save;
+        int error;
 
         pm_prepare_console();
         suspend_console();
-        ftrace_save = __ftrace_enabled_save();
         error = device_suspend(PMSG_QUIESCE);
         if (error)
                 goto Finish;
@@ -389,7 +385,6 @@ 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;
@@ -402,7 +397,7 @@ int hibernation_restore(int platform_mode)
 
 int hibernation_platform_enter(void)
 {
-        int error, ftrace_save;
+        int error;
 
         if (!hibernation_ops)
                 return -ENOSYS;
@@ -417,7 +412,6 @@ 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)
@@ -452,7 +446,6 @@ 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();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b8f7ce9473e8..613f16941b85 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -22,7 +22,6 @@
 #include <linux/freezer.h>
 #include <linux/vmstat.h>
 #include <linux/syscalls.h>
-#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -317,7 +316,7 @@ static int suspend_enter(suspend_state_t state)
  */
 int suspend_devices_and_enter(suspend_state_t state)
 {
-        int error, ftrace_save;
+        int error;
 
         if (!suspend_ops)
                 return -ENOSYS;
@@ -328,7 +327,6 @@ int suspend_devices_and_enter(suspend_state_t state)
                         goto Close;
         }
         suspend_console();
-        ftrace_save = __ftrace_enabled_save();
         suspend_test_start();
         error = device_suspend(PMSG_SUSPEND);
         if (error) {
@@ -360,7 +358,6 @@ int suspend_devices_and_enter(suspend_state_t state)
         suspend_test_start();
         device_resume(PMSG_RESUME);
         suspend_test_finish("resume devices");
-        __ftrace_enabled_restore(ftrace_save);
         resume_console();
  Close:
         if (suspend_ops->end)