diff options
Diffstat (limited to 'kernel/power/main.c')
| -rw-r--r-- | kernel/power/main.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index 42bd800a6755..5ce00902c7e3 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -361,6 +361,57 @@ static ssize_t pm_wakeup_irq_show(struct kobject *kobj, power_attr_ro(pm_wakeup_irq); +static bool pm_debug_messages_on __read_mostly; + +static ssize_t pm_debug_messages_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", pm_debug_messages_on); +} + +static ssize_t pm_debug_messages_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + if (val > 1) + return -EINVAL; + + pm_debug_messages_on = !!val; + return n; +} + +power_attr(pm_debug_messages); + +/** + * pm_pr_dbg - Print a suspend debug message to the kernel log. + * @fmt: Message format. + * + * The message will be emitted if enabled through the pm_debug_messages + * sysfs attribute. + */ +void pm_pr_dbg(const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (!pm_debug_messages_on) + return; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + printk(KERN_DEBUG "PM: %pV", &vaf); + + va_end(args); +} + #else /* !CONFIG_PM_SLEEP_DEBUG */ static inline void pm_print_times_init(void) {} #endif /* CONFIG_PM_SLEEP_DEBUG */ @@ -697,6 +748,7 @@ static struct attribute * g[] = { #ifdef CONFIG_PM_SLEEP_DEBUG &pm_print_times_attr.attr, &pm_wakeup_irq_attr.attr, + &pm_debug_messages_attr.attr, #endif #endif #ifdef CONFIG_FREEZER |