Merge branch 'linus' into cpus4096-for-linus

[pandora-kernel.git] / kernel / time / clocksource.c

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 7f60097..60ceabd 100644 (file)
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -141,8 +141,16 @@ static void clocksource_watchdog(unsigned long data)
        }
 
        if (!list_empty(&watchdog_list)) {
-               __mod_timer(&watchdog_timer,
-                           watchdog_timer.expires + WATCHDOG_INTERVAL);
+               /*
+                * Cycle through CPUs to check if the CPUs stay
+                * synchronized to each other.
+                */
+               int next_cpu = next_cpu_nr(raw_smp_processor_id(), cpu_online_map);
+
+               if (next_cpu >= nr_cpu_ids)
+                       next_cpu = first_cpu(cpu_online_map);
+               watchdog_timer.expires += WATCHDOG_INTERVAL;
+               add_timer_on(&watchdog_timer, next_cpu);
        }
        spin_unlock(&watchdog_lock);
 }
@@ -164,7 +172,8 @@ static void clocksource_check_watchdog(struct clocksource *cs)
                if (!started && watchdog) {
                        watchdog_last = watchdog->read();
                        watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL;
-                       add_timer(&watchdog_timer);
+                       add_timer_on(&watchdog_timer,
+                                    first_cpu(cpu_online_map));
                }
        } else {
                if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
@@ -185,7 +194,8 @@ static void clocksource_check_watchdog(struct clocksource *cs)
                                watchdog_last = watchdog->read();
                                watchdog_timer.expires =
                                        jiffies + WATCHDOG_INTERVAL;
-                               add_timer(&watchdog_timer);
+                               add_timer_on(&watchdog_timer,
+                                            first_cpu(cpu_online_map));
                        }
                }
        }
@@ -221,6 +231,18 @@ void clocksource_resume(void)
        spin_unlock_irqrestore(&clocksource_lock, flags);
 }
 
+/**
+ * clocksource_touch_watchdog - Update watchdog
+ *
+ * Update the watchdog after exception contexts such as kgdb so as not
+ * to incorrectly trip the watchdog.
+ *
+ */
+void clocksource_touch_watchdog(void)
+{
+       clocksource_resume_watchdog();
+}
+
 /**
  * clocksource_get_next - Returns the selected clocksource
  *
@@ -449,10 +471,10 @@ sysfs_show_available_clocksources(struct sys_device *dev, char *buf)
 /*
  * Sysfs setup bits:
  */
-static SYSDEV_ATTR(current_clocksource, 0600, sysfs_show_current_clocksources,
+static SYSDEV_ATTR(current_clocksource, 0644, sysfs_show_current_clocksources,
                   sysfs_override_clocksource);
 
-static SYSDEV_ATTR(available_clocksource, 0600,
+static SYSDEV_ATTR(available_clocksource, 0444,
                   sysfs_show_available_clocksources, NULL);
 
 static struct sysdev_class clocksource_sysclass = {