Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH v2 2/3] PM / sleep: Mark suspend/hibernation start and finish | Date | Thu, 20 Jul 2017 03:38:07 +0200 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Regardless of whether or not debug messages from the core system suspend/hibernation code are enabled, it is useful to know when system-wide transitions start and finish (or fail), so print "info" messages at these points.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> ---
-> v2: Smiplified the messages as suggested by Mark.
--- kernel/power/hibernate.c | 5 +++++ kernel/power/suspend.c | 2 ++ 2 files changed, 7 insertions(+)
Index: linux-pm/kernel/power/hibernate.c =================================================================== --- linux-pm.orig/kernel/power/hibernate.c +++ linux-pm/kernel/power/hibernate.c @@ -692,6 +692,7 @@ int hibernate(void) goto Unlock; } + pr_info("hibernation entry\n"); pm_prepare_console(); error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); if (error) { @@ -762,6 +763,8 @@ int hibernate(void) atomic_inc(&snapshot_device_available); Unlock: unlock_system_sleep(); + pr_info("hibernation exit\n"); + return error; } @@ -868,6 +871,7 @@ static int software_resume(void) goto Unlock; } + pr_info("resume from hibernation\n"); pm_prepare_console(); error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); if (error) { @@ -884,6 +888,7 @@ static int software_resume(void) Finish: __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); pm_restore_console(); + pr_info("resume from hibernation failed (%d)\n", error); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: Index: linux-pm/kernel/power/suspend.c =================================================================== --- linux-pm.orig/kernel/power/suspend.c +++ linux-pm/kernel/power/suspend.c @@ -579,6 +579,7 @@ int pm_suspend(suspend_state_t state) if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) return -EINVAL; + pr_info("PM: suspend entry (%s)\n", pm_states[state]); error = enter_state(state); if (error) { suspend_stats.fail++; @@ -586,6 +587,7 @@ int pm_suspend(suspend_state_t state) } else { suspend_stats.success++; } + pr_info("PM: suspend exit\n"); return error; } EXPORT_SYMBOL(pm_suspend);
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