[PATCH] Add debugging feature /proc/timer_list

[pandora-kernel.git] / kernel / softirq.c

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 3789ca9..8b75008 100644 (file)
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -17,6 +17,7 @@
 #include <linux/kthread.h>
 #include <linux/rcupdate.h>
 #include <linux/smp.h>
+#include <linux/tick.h>
 
 #include <asm/irq.h>
 /*
@@ -273,6 +274,18 @@ EXPORT_SYMBOL(do_softirq);
 
 #endif
 
+/*
+ * Enter an interrupt context.
+ */
+void irq_enter(void)
+{
+       __irq_enter();
+#ifdef CONFIG_NO_HZ
+       if (idle_cpu(smp_processor_id()))
+               tick_nohz_update_jiffies();
+#endif
+}
+
 #ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED
 # define invoke_softirq()      __do_softirq()
 #else
@@ -289,6 +302,12 @@ void irq_exit(void)
        sub_preempt_count(IRQ_EXIT_OFFSET);
        if (!in_interrupt() && local_softirq_pending())
                invoke_softirq();
+
+#ifdef CONFIG_NO_HZ
+       /* Make sure that timer wheel updates are propagated */
+       if (!in_interrupt() && idle_cpu(smp_processor_id()) && !need_resched())
+               tick_nohz_stop_sched_tick();
+#endif
        preempt_enable_no_resched();
 }
 
@@ -574,8 +593,6 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
 
        switch (action) {
        case CPU_UP_PREPARE:
-               BUG_ON(per_cpu(tasklet_vec, hotcpu).list);
-               BUG_ON(per_cpu(tasklet_hi_vec, hotcpu).list);
                p = kthread_create(ksoftirqd, hcpu, "ksoftirqd/%d", hotcpu);
                if (IS_ERR(p)) {
                        printk("ksoftirqd for %i failed\n", hotcpu);
@@ -612,7 +629,9 @@ static struct notifier_block __cpuinitdata cpu_nfb = {
 __init int spawn_ksoftirqd(void)
 {
        void *cpu = (void *)(long)smp_processor_id();
-       cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
+       int err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
+
+       BUG_ON(err == NOTIFY_BAD);
        cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
        register_cpu_notifier(&cpu_nfb);
        return 0;