5 files changed, 73 insertions, 16 deletions

diff --git a/kernel/printk.c b/kernel/printk.c
index a430fd04008b..aee891a869a4 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -577,9 +577,6 @@ static int have_callable_console(void)
  * @fmt: format string
  *
  * This is printk().  It can be called from any context.  We want it to work.
- * Be aware of the fact that if oops_in_progress is not set, we might try to
- * wake klogd up which could deadlock on runqueue lock if printk() is called
- * from scheduler code.
  *
  * We try to grab the console_sem.  If we succeed, it's easy - we log the output and
  * call the console drivers.  If we fail to get the semaphore we place the output
@@ -982,10 +979,25 @@ int is_console_locked(void)
         return console_locked;
 }
 
-void wake_up_klogd(void)
+static DEFINE_PER_CPU(int, printk_pending);
+
+void printk_tick(void)
 {
-        if (!oops_in_progress && waitqueue_active(&log_wait))
+        if (__get_cpu_var(printk_pending)) {
+                __get_cpu_var(printk_pending) = 0;
                 wake_up_interruptible(&log_wait);
+        }
+}
+
+int printk_needs_cpu(int cpu)
+{
+        return per_cpu(printk_pending, cpu);
+}
+
+void wake_up_klogd(void)
+{
+        if (waitqueue_active(&log_wait))
+                __raw_get_cpu_var(printk_pending) = 1;
 }
 
 /**
diff --git a/kernel/resource.c b/kernel/resource.c
index 414d6fc9131e..7797dae85b50 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -38,10 +38,6 @@ EXPORT_SYMBOL(iomem_resource);
 
 static DEFINE_RWLOCK(resource_lock);
 
-#ifdef CONFIG_PROC_FS
-
-enum { MAX_IORES_LEVEL = 5 };
-
 static void *r_next(struct seq_file *m, void *v, loff_t *pos)
 {
         struct resource *p = v;
@@ -53,6 +49,10 @@ static void *r_next(struct seq_file *m, void *v, loff_t *pos)
         return p->sibling;
 }
 
+#ifdef CONFIG_PROC_FS
+
+enum { MAX_IORES_LEVEL = 5 };
+
 static void *r_start(struct seq_file *m, loff_t *pos)
         __acquires(resource_lock)
 {
@@ -549,13 +549,9 @@ static void __init __reserve_region_with_split(struct resource *root,
         }
 
         if (!res) {
-                printk(KERN_DEBUG "    __reserve_region_with_split: (%s) [%llx, %llx], res: (%s) [%llx, %llx]\n",
-                         conflict->name, conflict->start, conflict->end,
-                         name, start, end);
-
                 /* failed, split and try again */
 
-                /* conflict coverred whole area */
+                /* conflict covered whole area */
                 if (conflict->start <= start && conflict->end >= end)
                         return;
 
@@ -831,3 +827,40 @@ static int __init reserve_setup(char *str)
 }
 
 __setup("reserve=", reserve_setup);
+
+/*
+ * Check if the requested addr and size spans more than any slot in the
+ * iomem resource tree.
+ */
+int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
+{
+        struct resource *p = &iomem_resource;
+        int err = 0;
+        loff_t l;
+
+        read_lock(&resource_lock);
+        for (p = p->child; p ; p = r_next(NULL, p, &l)) {
+                /*
+                 * We can probably skip the resources without
+                 * IORESOURCE_IO attribute?
+                 */
+                if (p->start >= addr + size)
+                        continue;
+                if (p->end < addr)
+                        continue;
+                if (p->start <= addr && (p->end >= addr + size - 1))
+                        continue;
+                printk(KERN_WARNING "resource map sanity check conflict: "
+                       "0x%llx 0x%llx 0x%llx 0x%llx %s\n",
+                       (unsigned long long)addr,
+                       (unsigned long long)(addr + size - 1),
+                       (unsigned long long)p->start,
+                       (unsigned long long)p->end,
+                       p->name);
+                err = -1;
+                break;
+        }
+        read_unlock(&resource_lock);
+
+        return err;
+}
diff --git a/kernel/softirq.c b/kernel/softirq.c
index c506f266a6b9..be7a8292f992 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -46,7 +46,7 @@ irq_cpustat_t irq_stat[NR_CPUS] ____cacheline_aligned;
 EXPORT_SYMBOL(irq_stat);
 #endif
 
-static struct softirq_action softirq_vec[32] __cacheline_aligned_in_smp;
+static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
 
 static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
@@ -205,7 +205,18 @@ restart:
 
         do {
                 if (pending & 1) {
+                        int prev_count = preempt_count();
+
                         h->action(h);
+
+                        if (unlikely(prev_count != preempt_count())) {
+                                printk(KERN_ERR "huh, entered softirq %d %p"
+                                       "with preempt_count %08x,"
+                                       " exited with %08x?\n", h - softirq_vec,
+                                       h->action, prev_count, preempt_count());
+                                preempt_count() = prev_count;
+                        }
+
                         rcu_bh_qsctr_inc(cpu);
                 }
                 h++;
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index a4d219398167..b711ffcb106c 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -270,7 +270,7 @@ void tick_nohz_stop_sched_tick(int inidle)
         next_jiffies = get_next_timer_interrupt(last_jiffies);
         delta_jiffies = next_jiffies - last_jiffies;
 
-        if (rcu_needs_cpu(cpu))
+        if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu))
                 delta_jiffies = 1;
         /*
          * Do not stop the tick, if we are only one off
diff --git a/kernel/timer.c b/kernel/timer.c
index 03bc7f1f1593..510fe69351ca 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -978,6 +978,7 @@ void update_process_times(int user_tick)
         run_local_timers();
         if (rcu_pending(cpu))
                 rcu_check_callbacks(cpu, user_tick);
+        printk_tick();
         scheduler_tick();
         run_posix_cpu_timers(p);
 }