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author | Rafael J. Wysocki <rjw@sisk.pl> | 2010-09-22 22:09:10 +0200 |
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committer | Rafael J. Wysocki <rjw@sisk.pl> | 2010-10-17 01:57:43 +0200 |
commit | 074037ec79bea73edf1b1ec72fef1010e83e3cc5 (patch) | |
tree | 1876caa07f755e680da5ea102d985efe4b508d56 /kernel | |
parent | PM: Fix signed/unsigned warning in dpm_show_time() (diff) | |
download | linux-074037ec79bea73edf1b1ec72fef1010e83e3cc5.tar.xz linux-074037ec79bea73edf1b1ec72fef1010e83e3cc5.zip |
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')
-rw-r--r-- | kernel/power/main.c | 8 |
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; } |