revert "clocksource: make clocksource watchdog cycle through online CPUs"

[sfrench/cifs-2.6.git] / kernel / time / clocksource.c

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index c8a9d13874dfdcf85c6b2ab9d7d03f92a8f39401..278534bbca956a93de37352767b91cc72aa87dcd 100644 (file)
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -91,7 +91,6 @@ static void clocksource_ratewd(struct clocksource *cs, int64_t delta)
               cs->name, delta);
        cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
        clocksource_change_rating(cs, 0);
-       cs->flags &= ~CLOCK_SOURCE_WATCHDOG;
        list_del(&cs->wd_list);
 }
 
@@ -175,7 +174,7 @@ static void clocksource_check_watchdog(struct clocksource *cs)
                        if (watchdog)
                                del_timer(&watchdog_timer);
                        watchdog = cs;
-                       init_timer(&watchdog_timer);
+                       init_timer_deferrable(&watchdog_timer);
                        watchdog_timer.function = clocksource_watchdog;
 
                        /* Reset watchdog cycles */
@@ -331,6 +330,21 @@ void clocksource_change_rating(struct clocksource *cs, int rating)
        spin_unlock_irqrestore(&clocksource_lock, flags);
 }
 
+/**
+ * clocksource_unregister - remove a registered clocksource
+ */
+void clocksource_unregister(struct clocksource *cs)
+{
+       unsigned long flags;
+
+       spin_lock_irqsave(&clocksource_lock, flags);
+       list_del(&cs->list);
+       if (clocksource_override == cs)
+               clocksource_override = NULL;
+       next_clocksource = select_clocksource();
+       spin_unlock_irqrestore(&clocksource_lock, flags);
+}
+
 #ifdef CONFIG_SYSFS
 /**
  * sysfs_show_current_clocksources - sysfs interface for current clocksource
@@ -342,15 +356,13 @@ void clocksource_change_rating(struct clocksource *cs, int rating)
 static ssize_t
 sysfs_show_current_clocksources(struct sys_device *dev, char *buf)
 {
-       char *curr = buf;
+       ssize_t count = 0;
 
        spin_lock_irq(&clocksource_lock);
-       curr += sprintf(curr, "%s ", curr_clocksource->name);
+       count = snprintf(buf, PAGE_SIZE, "%s\n", curr_clocksource->name);
        spin_unlock_irq(&clocksource_lock);
 
-       curr += sprintf(curr, "\n");
-
-       return curr - buf;
+       return count;
 }
 
 /**
@@ -418,17 +430,20 @@ static ssize_t
 sysfs_show_available_clocksources(struct sys_device *dev, char *buf)
 {
        struct clocksource *src;
-       char *curr = buf;
+       ssize_t count = 0;
 
        spin_lock_irq(&clocksource_lock);
        list_for_each_entry(src, &clocksource_list, list) {
-               curr += sprintf(curr, "%s ", src->name);
+               count += snprintf(buf + count,
+                                 max((ssize_t)PAGE_SIZE - count, (ssize_t)0),
+                                 "%s ", src->name);
        }
        spin_unlock_irq(&clocksource_lock);
 
-       curr += sprintf(curr, "\n");
+       count += snprintf(buf + count,
+                         max((ssize_t)PAGE_SIZE - count, (ssize_t)0), "\n");
 
-       return curr - buf;
+       return count;
 }
 
 /*
@@ -441,7 +456,7 @@ static SYSDEV_ATTR(available_clocksource, 0600,
                   sysfs_show_available_clocksources, NULL);
 
 static struct sysdev_class clocksource_sysclass = {
-       set_kset_name("clocksource"),
+       .name = "clocksource",
 };
 
 static struct sys_device device_clocksource = {