Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  ftrace: fix modular build
  ftrace: disable tracing on acpi idle calls
  ftrace: remove latency-tracer leftover
  ftrace: only trace preempt off with preempt tracer
  ftrace: fix 4d3702b6 (post-v2.6.26): WARNING: at kernel/lockdep.c:2731 check_flags (ftrace)

4 files changed, 28 insertions, 16 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index d592dbb1d12a..b7f2963693a7 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -272,6 +272,8 @@ static atomic_t c3_cpu_count;
 /* Common C-state entry for C2, C3, .. */
 static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
 {
+        /* Don't trace irqs off for idle */
+        stop_critical_timings();
         if (cstate->entry_method == ACPI_CSTATE_FFH) {
                 /* Call into architectural FFH based C-state */
                 acpi_processor_ffh_cstate_enter(cstate);
@@ -284,6 +286,7 @@ static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
                    gets asserted in time to freeze execution properly. */
                 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
         }
+        start_critical_timings();
 }
 #endif /* !CONFIG_CPU_IDLE */
 
@@ -1418,6 +1421,8 @@ static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr,
  */
 static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
 {
+        /* Don't trace irqs off for idle */
+        stop_critical_timings();
         if (cx->entry_method == ACPI_CSTATE_FFH) {
                 /* Call into architectural FFH based C-state */
                 acpi_processor_ffh_cstate_enter(cx);
@@ -1432,6 +1437,7 @@ static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
                    gets asserted in time to freeze execution properly. */
                 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
         }
+        start_critical_timings();
 }
 
 /**
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 868e121c8e38..fc20e09a6cb1 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1203,9 +1203,6 @@ static void *s_next(struct seq_file *m, void *v, loff_t *pos)
 
         iter->pos = *pos;
 
-        if (last_ent && !ent)
-                seq_puts(m, "\n\nvim:ft=help\n");
-
         return ent;
 }
 
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 421d6fe3650e..ece6cfb649fa 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -253,12 +253,14 @@ void start_critical_timings(void)
         if (preempt_trace() || irq_trace())
                 start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
 }
+EXPORT_SYMBOL_GPL(start_critical_timings);
 
 void stop_critical_timings(void)
 {
         if (preempt_trace() || irq_trace())
                 stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
 }
+EXPORT_SYMBOL_GPL(stop_critical_timings);
 
 #ifdef CONFIG_IRQSOFF_TRACER
 #ifdef CONFIG_PROVE_LOCKING
@@ -337,12 +339,14 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller);
 #ifdef CONFIG_PREEMPT_TRACER
 void trace_preempt_on(unsigned long a0, unsigned long a1)
 {
-        stop_critical_timing(a0, a1);
+        if (preempt_trace())
+                stop_critical_timing(a0, a1);
 }
 
 void trace_preempt_off(unsigned long a0, unsigned long a1)
 {
-        start_critical_timing(a0, a1);
+        if (preempt_trace())
+                start_critical_timing(a0, a1);
 }
 #endif /* CONFIG_PREEMPT_TRACER */
 
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 3c8d61df4474..e303ccb62cdf 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -26,7 +26,8 @@ static struct task_struct	*wakeup_task;
 static int                      wakeup_cpu;
 static unsigned                 wakeup_prio = -1;
 
-static DEFINE_SPINLOCK(wakeup_lock);
+static raw_spinlock_t wakeup_lock =
+        (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
 
 static void __wakeup_reset(struct trace_array *tr);
 
@@ -56,7 +57,8 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
         if (unlikely(disabled != 1))
                 goto out;
 
-        spin_lock_irqsave(&wakeup_lock, flags);
+        local_irq_save(flags);
+        __raw_spin_lock(&wakeup_lock);
 
         if (unlikely(!wakeup_task))
                 goto unlock;
@@ -71,7 +73,8 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
         trace_function(tr, data, ip, parent_ip, flags);
 
  unlock:
-        spin_unlock_irqrestore(&wakeup_lock, flags);
+        __raw_spin_unlock(&wakeup_lock);
+        local_irq_restore(flags);
 
  out:
         atomic_dec(&data->disabled);
@@ -145,7 +148,8 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
         if (likely(disabled != 1))
                 goto out;
 
-        spin_lock_irqsave(&wakeup_lock, flags);
+        local_irq_save(flags);
+        __raw_spin_lock(&wakeup_lock);
 
         /* We could race with grabbing wakeup_lock */
         if (unlikely(!tracer_enabled || next != wakeup_task))
@@ -174,7 +178,8 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
 
 out_unlock:
         __wakeup_reset(tr);
-        spin_unlock_irqrestore(&wakeup_lock, flags);
+        __raw_spin_unlock(&wakeup_lock);
+        local_irq_restore(flags);
 out:
         atomic_dec(&tr->data[cpu]->disabled);
 }
@@ -209,8 +214,6 @@ static void __wakeup_reset(struct trace_array *tr)
         struct trace_array_cpu *data;
         int cpu;
 
-        assert_spin_locked(&wakeup_lock);
-
         for_each_possible_cpu(cpu) {
                 data = tr->data[cpu];
                 tracing_reset(data);
@@ -229,9 +232,11 @@ static void wakeup_reset(struct trace_array *tr)
 {
         unsigned long flags;
 
-        spin_lock_irqsave(&wakeup_lock, flags);
+        local_irq_save(flags);
+        __raw_spin_lock(&wakeup_lock);
         __wakeup_reset(tr);
-        spin_unlock_irqrestore(&wakeup_lock, flags);
+        __raw_spin_unlock(&wakeup_lock);
+        local_irq_restore(flags);
 }
 
 static void
@@ -252,7 +257,7 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
                 goto out;
 
         /* interrupts should be off from try_to_wake_up */
-        spin_lock(&wakeup_lock);
+        __raw_spin_lock(&wakeup_lock);
 
         /* check for races. */
         if (!tracer_enabled || p->prio >= wakeup_prio)
@@ -274,7 +279,7 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
                        CALLER_ADDR1, CALLER_ADDR2, flags);
 
 out_locked:
-        spin_unlock(&wakeup_lock);
+        __raw_spin_unlock(&wakeup_lock);
 out:
         atomic_dec(&tr->data[cpu]->disabled);
 }