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ftrace: irqsoff use raw_smp_processor_id 

This patch changes the use of __get_cpu_var to explicitly calling
raw_smp_processor_id and using the per_cpu() macro. On some debug
configurations, the use of __get_cpu_var may cause ftrace to trigger
and this can cause problems with the irqsoff tracing.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Steven Rostedt 2008-05-12 21:20:55 +02:00 committed by Thomas Gleixner
parent 4d9493c90f
commit c5f888cae4
1 changed files with 10 additions and 9 deletions
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19
kernel/trace/trace_irqsoff.c
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@ -204,14 +204,14 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
if (likely(!tracer_enabled))
return;
if (__get_cpu_var(tracing_cpu))
cpu = raw_smp_processor_id();
if (per_cpu(tracing_cpu, cpu))
return;
cpu = raw_smp_processor_id();
data = tr->data[cpu];
if (unlikely(!data) || unlikely(!head_page(data)) ||
atomic_read(&data->disabled))
if (unlikely(!data) || atomic_read(&data->disabled))
return;
atomic_inc(&data->disabled);
@ -225,7 +225,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
trace_function(tr, data, ip, parent_ip, flags);
__get_cpu_var(tracing_cpu) = 1;
per_cpu(tracing_cpu, cpu) = 1;
atomic_dec(&data->disabled);
}
@ -238,16 +238,16 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
struct trace_array_cpu *data;
unsigned long flags;
cpu = raw_smp_processor_id();
/* Always clear the tracing cpu on stopping the trace */
if (unlikely(__get_cpu_var(tracing_cpu)))
__get_cpu_var(tracing_cpu) = 0;
if (unlikely(per_cpu(tracing_cpu, cpu)))
per_cpu(tracing_cpu, cpu) = 0;
else
return;
if (!tracer_enabled)
return;
cpu = raw_smp_processor_id();
data = tr->data[cpu];
if (unlikely(!data) || unlikely(!head_page(data)) ||
@ -255,6 +255,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
return;
atomic_inc(&data->disabled);
local_save_flags(flags);
trace_function(tr, data, ip, parent_ip, flags);
check_critical_timing(tr, data, parent_ip ? : ip, cpu);
@ -376,7 +377,7 @@ static void stop_irqsoff_tracer(struct trace_array *tr)
static void __irqsoff_tracer_init(struct trace_array *tr)
{
irqsoff_trace = tr;
/* make sure that the tracer is visibel */
/* make sure that the tracer is visible */
smp_wmb();
if (tr->ctrl)