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

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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>
This commit is contained in:
Ingo Molnar
2008-11-23 10:37:12 +01:00
parent a0a70c735e
commit cbe2f5a6e8
2 changed files with 4 additions and 14 deletions
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5
kernel/power/main.c
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@@ -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)