[for-next][PATCH 2/6] trace/osnoise: Fix no previous prototype warnings

Steven Rostedt
2021-06-29T11:48:56Z

kernel test robot reported some osnoise functions with "no previous
prototype."

Fix these warnings by making local functions static, and by adding:

void osnoise_trace_irq_entry(int id);
void osnoise_trace_irq_exit(int id, const char *desc);

to include/linux/trace.h.

Link: https://lkml.kernel.org/r/e40d3cb4be8bde921f4b40fa6a095cf85ab807bd.1624872608.git.bristot@redhat.com

Fixes: bce29ac9ce0b ("trace: Add osnoise tracer")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
arch/x86/kernel/trace.c | 3 ---
include/linux/trace.h | 2 ++
kernel/trace/trace_osnoise.c | 20 +++++++++++---------
3 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/trace.c b/arch/x86/kernel/trace.c
index 6912672c33a7..6b73b6f92ad3 100644
--- a/arch/x86/kernel/trace.c
+++ b/arch/x86/kernel/trace.c
@@ -2,9 +2,6 @@
#include <linux/trace.h>

#if defined(CONFIG_OSNOISE_TRACER) && defined(CONFIG_X86_LOCAL_APIC)
-extern void osnoise_trace_irq_entry(int id);
-extern void osnoise_trace_irq_exit(int id, const char *desc);
-
/*
* trace_intel_irq_entry - record intel specific IRQ entry
*/
diff --git a/include/linux/trace.h b/include/linux/trace.h
index 4e3858640c47..bf169612ffe1 100644
--- a/include/linux/trace.h
+++ b/include/linux/trace.h
@@ -45,6 +45,8 @@ int trace_array_destroy(struct trace_array *tr);
/* For osnoise tracer */
int osnoise_arch_register(void);
void osnoise_arch_unregister(void);
+void osnoise_trace_irq_entry(int id);
+void osnoise_trace_irq_exit(int id, const char *desc);

#endif /* CONFIG_TRACING */

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 556d530af805..9c3109e3ffeb 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -736,7 +736,7 @@ void __weak osnoise_arch_unregister(void)
* This function hooks the IRQ related callbacks to the respective trace
* events.
*/
-int hook_irq_events(void)
+static int hook_irq_events(void)
{
int ret;

@@ -768,7 +768,7 @@ int hook_irq_events(void)
* This function unhooks the IRQ related callbacks to the respective trace
* events.
*/
-void unhook_irq_events(void)
+static void unhook_irq_events(void)
{
osnoise_arch_unregister();
unregister_trace_irq_handler_exit(trace_irqexit_callback, NULL);
@@ -785,7 +785,7 @@ void unhook_irq_events(void)
* arrival time. The delta_start is used to compute the duration at the
* softirq exit handler. See cond_move_softirq_delta_start().
*/
-void trace_softirq_entry_callback(void *data, unsigned int vec_nr)
+static void trace_softirq_entry_callback(void *data, unsigned int vec_nr)
{
struct osnoise_variables *osn_var = this_cpu_osn_var();

@@ -808,7 +808,7 @@ void trace_softirq_entry_callback(void *data, unsigned int vec_nr)
* Computes the duration of the softirq noise, and trace it. Also discounts the
* interference from other sources of noise could be currently being accounted.
*/
-void trace_softirq_exit_callback(void *data, unsigned int vec_nr)
+static void trace_softirq_exit_callback(void *data, unsigned int vec_nr)
{
struct osnoise_variables *osn_var = this_cpu_osn_var();
int duration;
@@ -949,7 +949,7 @@ thread_exit(struct osnoise_variables *osn_var, struct task_struct *t)
* This function is hooked to the sched:sched_switch trace event, and it is
* used to record the beginning and to report the end of a thread noise window.
*/
-void
+static void
trace_sched_switch_callback(void *data, bool preempt, struct task_struct *p,
struct task_struct *n)
{
@@ -968,7 +968,7 @@ trace_sched_switch_callback(void *data, bool preempt, struct task_struct *p,
* Hook the osnoise tracer callbacks to handle the noise from other
* threads on the necessary kernel events.
*/
-int hook_thread_events(void)
+static int hook_thread_events(void)
{
int ret;

@@ -985,7 +985,7 @@ int hook_thread_events(void)
* Unook the osnoise tracer callbacks to handle the noise from other
* threads on the necessary kernel events.
*/
-void unhook_thread_events(void)
+static void unhook_thread_events(void)
{
unregister_trace_sched_switch(trace_sched_switch_callback, NULL);
}
@@ -997,7 +997,8 @@ void unhook_thread_events(void)
* values will be used later to compute the diff betwneen the statistics
* before and after the osnoise sampling.
*/
-void save_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
+static void
+save_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
{
s->nmi_count = osn_var->nmi.count;
s->irq_count = osn_var->irq.count;
@@ -1012,7 +1013,8 @@ void save_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sam
* statistics. The struct osnoise_sample *s contains the statistics saved via
* save_osn_sample_stats() before the osnoise sampling.
*/
-void diff_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
+static void
+diff_osn_sample_stats(struct osnoise_variables *osn_var, struct osnoise_sample *s)
{
s->nmi_count = osn_var->nmi.count - s->nmi_count;
s->irq_count = osn_var->irq.count - s->irq_count;
--
2.30.2