Subject: [PATCH 1/1] tracing: Fix compile error in trace_array calls when TRACING is disabled

From: Arun Easi <[email-masked]>
Date: Tue, 6 Sep 2022 19:38:00 -0700

Fix this compilation error seen when CONFIG_TRACING is not enabled:

drivers/scsi/qla2xxx/qla_os.c: In function 'qla_trace_init':
drivers/scsi/qla2xxx/qla_os.c:2854:25: error: implicit declaration of function
'trace_array_get_by_name'; did you mean 'trace_array_set_clr_event'?
[-Werror=implicit-function-declaration]
 2854 |         qla_trc_array = trace_array_get_by_name("qla2xxx");
      |                         ^~~~~~~~~~~~~~~~~~~~~~~
      |                         trace_array_set_clr_event

drivers/scsi/qla2xxx/qla_os.c: In function 'qla_trace_uninit':
drivers/scsi/qla2xxx/qla_os.c:2869:9: error: implicit declaration of function
'trace_array_put' [-Werror=implicit-function-declaration]
 2869 |         trace_array_put(qla_trc_array);
      |         ^~~~~~~~~~~~~~~

Reported-by: kernel test robot <[email-masked]>
Signed-off-by: Arun Easi <[email-masked]>
---
 include/linux/trace.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/trace.h b/include/linux/trace.h
index bf16961..bf206c3 100644
--- a/include/linux/trace.h
+++ b/include/linux/trace.h
@@ -48,6 +48,23 @@ void osnoise_arch_unregister(void);
 void osnoise_trace_irq_entry(int id);
 void osnoise_trace_irq_exit(int id, const char *desc);
 
+#else	/* CONFIG_TRACING */
+#define TRACE_EXPORT_FUNCTION	0
+#define TRACE_EXPORT_EVENT	0
+#define TRACE_EXPORT_MARKER	0
+struct trace_export { };
+#define register_ftrace_export(export) -EINVAL
+#define unregister_ftrace_export(export) 0
+#define trace_printk_init_buffers()
+#define trace_array_printk(tr, ip, fmt, ...) 0
+#define trace_array_init_printk(tr) -EINVAL
+#define trace_array_put(tr)
+#define trace_array_get_by_name(name) NULL
+#define trace_array_destroy(tr) 0
+#define osnoise_arch_register() -EINVAL
+#define osnoise_arch_unregister()
+#define osnoise_trace_irq_entry(id)
+#define osnoise_trace_irq_exit(id, desc)
 #endif	/* CONFIG_TRACING */
 
 #endif	/* _LINUX_TRACE_H */
-- 
2.9.5