[for-next][PATCH 06/14] tracing/osnoise: Remove TIMERLAT ifdefs from inside functions

Steven Rostedt
2021-11-02T20:12:15Z

Remove CONFIG_TIMERLAT_TRACER from inside functions, avoiding
compilation problems in the future.

Link: https://lkml.kernel.org/r/8245abb5a112d249f5da6c1df499244ad9e647bc.1635702894.git.bristot@kernel.org

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: linux-rt-users@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_osnoise.c | 150 +++++++++++++++++++++++++----------
1 file changed, 106 insertions(+), 44 deletions(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 490615f6d721..5e832e3edf1f 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -321,6 +321,57 @@ static struct osnoise_data {
#endif
};

+#ifdef CONFIG_TIMERLAT_TRACER
+static inline bool timerlat_enabled(void)
+{
+ return osnoise_data.timerlat_tracer;
+}
+
+static inline int timerlat_softirq_exit(struct osnoise_variables *osn_var)
+{
+ struct timerlat_variables *tlat_var = this_cpu_tmr_var();
+ /*
+ * If the timerlat is enabled, but the irq handler did
+ * not run yet enabling timerlat_tracer, do not trace.
+ */
+ if (!tlat_var->tracing_thread) {
+ osn_var->softirq.arrival_time = 0;
+ osn_var->softirq.delta_start = 0;
+ return 0;
+ }
+ return 1;
+}
+
+static inline int timerlat_thread_exit(struct osnoise_variables *osn_var)
+{
+ struct timerlat_variables *tlat_var = this_cpu_tmr_var();
+ /*
+ * If the timerlat is enabled, but the irq handler did
+ * not run yet enabling timerlat_tracer, do not trace.
+ */
+ if (!tlat_var->tracing_thread) {
+ osn_var->thread.delta_start = 0;
+ osn_var->thread.arrival_time = 0;
+ return 0;
+ }
+ return 1;
+}
+#else /* CONFIG_TIMERLAT_TRACER */
+static inline bool timerlat_enabled(void)
+{
+ return false;
+}
+
+static inline int timerlat_softirq_exit(struct osnoise_variables *osn_var)
+{
+ return 1;
+}
+static inline int timerlat_thread_exit(struct osnoise_variables *osn_var)
+{
+ return 1;
+}
+#endif
+
#ifdef CONFIG_PREEMPT_RT
/*
* Print the osnoise header info.
@@ -978,21 +1029,9 @@ static void trace_softirq_exit_callback(void *data, unsigned int vec_nr)
if (!osn_var->sampling)
return;

-#ifdef CONFIG_TIMERLAT_TRACER
- /*
- * If the timerlat is enabled, but the irq handler did
- * not run yet enabling timerlat_tracer, do not trace.
- */
- if (unlikely(osnoise_data.timerlat_tracer)) {
- struct timerlat_variables *tlat_var;
- tlat_var = this_cpu_tmr_var();
- if (!tlat_var->tracing_thread) {
- osn_var->softirq.arrival_time = 0;
- osn_var->softirq.delta_start = 0;
+ if (unlikely(timerlat_enabled()))
+ if (!timerlat_softirq_exit(osn_var))
return;
- }
- }
-#endif

duration = get_int_safe_duration(osn_var, &osn_var->softirq.delta_start);
trace_softirq_noise(vec_nr, osn_var->softirq.arrival_time, duration);
@@ -1086,17 +1125,9 @@ thread_exit(struct osnoise_variables *osn_var, struct task_struct *t)
if (!osn_var->sampling)
return;

-#ifdef CONFIG_TIMERLAT_TRACER
- if (osnoise_data.timerlat_tracer) {
- struct timerlat_variables *tlat_var;
- tlat_var = this_cpu_tmr_var();
- if (!tlat_var->tracing_thread) {
- osn_var->thread.delta_start = 0;
- osn_var->thread.arrival_time = 0;
+ if (unlikely(timerlat_enabled()))
+ if (!timerlat_thread_exit(osn_var))
return;
- }
- }
-#endif

duration = get_int_safe_duration(osn_var, &osn_var->thread.delta_start);

@@ -1600,6 +1631,11 @@ static int timerlat_main(void *data)
hrtimer_cancel(&tlat->timer);
return 0;
}
+#else /* CONFIG_TIMERLAT_TRACER */
+static int timerlat_main(void *data)
+{
+ return 0;
+}
#endif /* CONFIG_TIMERLAT_TRACER */

/*
@@ -1642,16 +1678,13 @@ static int start_kthread(unsigned int cpu)
void *main = osnoise_main;
char comm[24];

-#ifdef CONFIG_TIMERLAT_TRACER
- if (osnoise_data.timerlat_tracer) {
+ if (timerlat_enabled()) {
snprintf(comm, 24, "timerlat/%d", cpu);
main = timerlat_main;
} else {
snprintf(comm, 24, "osnoise/%d", cpu);
}
-#else
- snprintf(comm, 24, "osnoise/%d", cpu);
-#endif
+
kthread = kthread_create_on_cpu(main, NULL, cpu, comm);

if (IS_ERR(kthread)) {
@@ -1945,6 +1978,35 @@ static const struct file_operations cpus_fops = {
.llseek = generic_file_llseek,
};

+#ifdef CONFIG_TIMERLAT_TRACER
+/*
+ * init_timerlat_tracefs - A function to initialize the timerlat interface files
+ */
+static int init_timerlat_tracefs(struct dentry *top_dir)
+{
+ struct dentry *tmp;
+
+#ifdef CONFIG_STACKTRACE
+ tmp = tracefs_create_file("print_stack", TRACE_MODE_WRITE, top_dir,
+ &osnoise_print_stack, &trace_min_max_fops);
+ if (!tmp)
+ return -ENOMEM;
+#endif
+
+ tmp = tracefs_create_file("timerlat_period_us", TRACE_MODE_WRITE, top_dir,
+ &timerlat_period, &trace_min_max_fops);
+ if (!tmp)
+ return -ENOMEM;
+
+ return 0;
+}
+#else /* CONFIG_TIMERLAT_TRACER */
+static int init_timerlat_tracefs(struct dentry *top_dir)
+{
+ return 0;
+}
+#endif /* CONFIG_TIMERLAT_TRACER */
+
/*
* init_tracefs - A function to initialize the tracefs interface files
*
@@ -1989,19 +2051,10 @@ static int init_tracefs(void)
tmp = trace_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops);
if (!tmp)
goto err;
-#ifdef CONFIG_TIMERLAT_TRACER
-#ifdef CONFIG_STACKTRACE
- tmp = tracefs_create_file("print_stack", TRACE_MODE_WRITE, top_dir,
- &osnoise_print_stack, &trace_min_max_fops);
- if (!tmp)
- goto err;
-#endif

- tmp = tracefs_create_file("timerlat_period_us", TRACE_MODE_WRITE, top_dir,
- &timerlat_period, &trace_min_max_fops);
- if (!tmp)
+ ret = init_timerlat_tracefs(top_dir);
+ if (ret)
goto err;
-#endif

return 0;

@@ -2207,6 +2260,16 @@ static struct tracer timerlat_tracer __read_mostly = {
.print_header = print_timerlat_headers,
.allow_instances = true,
};
+
+__init static int init_timerlat_tracer(void)
+{
+ return register_tracer(&timerlat_tracer);
+}
+#else /* CONFIG_TIMERLAT_TRACER */
+__init static int init_timerlat_tracer(void)
+{
+ return 0;
+}
#endif /* CONFIG_TIMERLAT_TRACER */

__init static int init_osnoise_tracer(void)
@@ -2223,13 +2286,12 @@ __init static int init_osnoise_tracer(void)
return ret;
}

-#ifdef CONFIG_TIMERLAT_TRACER
- ret = register_tracer(&timerlat_tracer);
+ ret = init_timerlat_tracer();
if (ret) {
- pr_err(BANNER "Error registering timerlat\n");
+ pr_err(BANNER "Error registering timerlat!\n");
return ret;
}
-#endif
+
osnoise_init_hotplug_support();

INIT_LIST_HEAD_RCU(&osnoise_instances);
--
2.33.0