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

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* '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)
This commit is contained in:
Linus Torvalds 2008-07-26 13:25:47 -07:00
commit a048d3aff8
4 changed files with 28 additions and 16 deletions
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6
drivers/acpi/processor_idle.c
View file

@ -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();
}
/**

3
kernel/trace/trace.c
View file

@ -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;
}

8
kernel/trace/trace_irqsoff.c
View file

@ -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 */

27
kernel/trace/trace_sched_wakeup.c
View file

@ -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);
}