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authorRafael J. Wysocki <rjw@sisk.pl>2010-09-22 22:09:10 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2010-10-17 01:57:43 +0200
commit074037ec79bea73edf1b1ec72fef1010e83e3cc5 (patch)
tree1876caa07f755e680da5ea102d985efe4b508d56 /kernel/power
parent0702d9ee0f1dcb6258789032f03b3208bfafaffc (diff)
downloadlinux-074037ec79bea73edf1b1ec72fef1010e83e3cc5.tar.bz2
PM / Wakeup: Introduce wakeup source objects and event statistics (v3)
Introduce struct wakeup_source for representing system wakeup sources within the kernel and for collecting statistics related to them. Make the recently introduced helper functions pm_wakeup_event(), pm_stay_awake() and pm_relax() use struct wakeup_source objects internally, so that wakeup statistics associated with wakeup devices can be collected and reported in a consistent way (the definition of pm_relax() is changed, which is harmless, because this function is not called directly by anyone yet). Introduce new wakeup-related sysfs device attributes in /sys/devices/.../power for reporting the device wakeup statistics. Change the global wakeup events counters event_count and events_in_progress into atomic variables, so that it is not necessary to acquire a global spinlock in pm_wakeup_event(), pm_stay_awake() and pm_relax(), which should allow us to avoid lock contention in these functions on SMP systems with many wakeup devices. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/main.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index f06ad6eff37a..6b12a0cf4d9f 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -237,18 +237,18 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
- unsigned long val;
+ unsigned int val;
- return pm_get_wakeup_count(&val) ? sprintf(buf, "%lu\n", val) : -EINTR;
+ return pm_get_wakeup_count(&val) ? sprintf(buf, "%u\n", val) : -EINTR;
}
static ssize_t wakeup_count_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
- unsigned long val;
+ unsigned int val;
- if (sscanf(buf, "%lu", &val) == 1) {
+ if (sscanf(buf, "%u", &val) == 1) {
if (pm_save_wakeup_count(val))
return n;
}