ftrace: remove trace array ctrl
Impact: remove obsolete variable in trace_array structure
With the new start / stop method of ftrace, the ctrl variable
in the trace_array structure is now obsolete. Remove it.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 9e83188..5843541 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -537,7 +537,6 @@
if (type->selftest) {
struct tracer *saved_tracer = current_trace;
struct trace_array *tr = &global_trace;
- int saved_ctrl = tr->ctrl;
int i;
/*
* Run a selftest on this tracer.
@@ -550,13 +549,11 @@
tracing_reset(tr, i);
}
current_trace = type;
- tr->ctrl = 0;
/* the test is responsible for initializing and enabling */
pr_info("Testing tracer %s: ", type->name);
ret = type->selftest(type, tr);
/* the test is responsible for resetting too */
current_trace = saved_tracer;
- tr->ctrl = saved_ctrl;
if (ret) {
printk(KERN_CONT "FAILED!\n");
goto out;
@@ -966,7 +963,7 @@
int cpu;
int pc;
- if (tracing_disabled || !tr->ctrl)
+ if (tracing_disabled)
return;
pc = preempt_count();
@@ -2820,7 +2817,6 @@
unsigned long val;
char buf[64];
int ret;
- struct trace_array *tr = filp->private_data;
if (cnt >= sizeof(buf))
return -EINVAL;
@@ -2840,12 +2836,7 @@
mutex_lock(&trace_types_lock);
- if (tr->ctrl) {
- cnt = -EBUSY;
- pr_info("ftrace: please disable tracing"
- " before modifying buffer size\n");
- goto out;
- }
+ tracing_stop();
if (val != global_trace.entries) {
ret = ring_buffer_resize(global_trace.buffer, val);
@@ -2878,6 +2869,7 @@
if (tracing_disabled)
cnt = -ENOMEM;
out:
+ tracing_start();
max_tr.entries = global_trace.entries;
mutex_unlock(&trace_types_lock);
@@ -2900,9 +2892,8 @@
{
char *buf;
char *end;
- struct trace_array *tr = &global_trace;
- if (!tr->ctrl || tracing_disabled)
+ if (tracing_disabled)
return -EINVAL;
if (cnt > TRACE_BUF_SIZE)
@@ -3131,7 +3122,7 @@
unsigned long flags, irq_flags;
int cpu, len = 0, size, pc;
- if (!tr->ctrl || tracing_disabled)
+ if (tracing_disabled)
return 0;
pc = preempt_count();
@@ -3365,7 +3356,6 @@
#endif
/* All seems OK, enable tracing */
- global_trace.ctrl = 1;
tracing_disabled = 0;
atomic_notifier_chain_register(&panic_notifier_list,