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Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0567f51bbea4..583fe24903d3 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -941,6 +941,30 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
trace_wake_up();
}
+void
+ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
+{
+ struct trace_array *tr = &global_trace;
+ struct trace_array_cpu *data;
+ unsigned long flags;
+ long disabled;
+ int cpu;
+
+ if (tracing_disabled || current_trace == &no_tracer || !tr->ctrl)
+ return;
+
+ local_irq_save(flags);
+ cpu = raw_smp_processor_id();
+ data = tr->data[cpu];
+ disabled = atomic_inc_return(&data->disabled);
+
+ if (likely(disabled == 1))
+ __trace_special(tr, data, arg1, arg2, arg3);
+
+ atomic_dec(&data->disabled);
+ local_irq_restore(flags);
+}
+
#ifdef CONFIG_FTRACE
static void
function_trace_call(unsigned long ip, unsigned long parent_ip)
@@ -2941,8 +2965,6 @@ __init static int tracer_alloc_buffers(void)
int ret = -ENOMEM;
int i;
- global_trace.ctrl = tracer_enabled;
-
/* TODO: make the number of buffers hot pluggable with CPUS */
tracing_nr_buffers = num_possible_cpus();
tracing_buffer_mask = cpu_possible_map;
@@ -3012,6 +3034,7 @@ __init static int tracer_alloc_buffers(void)
current_trace = &no_tracer;
/* All seems OK, enable tracing */
+ global_trace.ctrl = tracer_enabled;
tracing_disabled = 0;
return 0;