diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 3a231ceefa94..b584c67f57ab 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -608,6 +609,18 @@ static int enter_state(suspend_state_t state) return error; } +static void pm_suspend_marker(char *annotation) +{ + struct timespec ts; + struct rtc_time tm; + + getnstimeofday(&ts); + rtc_time_to_tm(ts.tv_sec, &tm); + pr_info("PM: suspend %s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n", + annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); +} + /** * pm_suspend - Externally visible function for suspending the system. * @state: System sleep state to enter. @@ -622,6 +635,7 @@ int pm_suspend(suspend_state_t state) if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) return -EINVAL; + pm_suspend_marker("entry"); pr_info("suspend entry (%s)\n", mem_sleep_labels[state]); error = enter_state(state); if (error) { @@ -630,6 +644,7 @@ int pm_suspend(suspend_state_t state) } else { suspend_stats.success++; } + pm_suspend_marker("exit"); pr_info("suspend exit\n"); return error; }