tracing: stop making gpio tracing configurable

gpio tracing was made configurable in 4.4-rc1 (commit ddd70280bf0e
("tracing: gpio: Add Kconfig option for enabling/disabling trace
events")). Since then it is the only event type that can be compiled
conditionally. Given that there is only little overhead I don't
understand the reasoning and I was annoyed more than once that gpio
events were not available without recompiling.

So drop the Kconfig symbol and make gpio events available
unconditionally.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

arch/arm/configs/aspeed_g4_defconfig

···
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHED_STACK_END_CHECK=y
 CONFIG_FUNCTION_TRACER=y
-# CONFIG_TRACING_EVENTS_GPIO is not set
 # CONFIG_RUNTIME_TESTING_MENU is not set
 CONFIG_DEBUG_WX=y
 CONFIG_DEBUG_USER=y

arch/arm/configs/aspeed_g5_defconfig

···
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHED_STACK_END_CHECK=y
 CONFIG_FUNCTION_TRACER=y
-# CONFIG_TRACING_EVENTS_GPIO is not set
 # CONFIG_RUNTIME_TESTING_MENU is not set
 CONFIG_DEBUG_WX=y
 CONFIG_DEBUG_USER=y

include/trace/events/gpio.h

···
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM gpio
 
-#ifndef CONFIG_TRACING_EVENTS_GPIO
-#define NOTRACE
-#endif
-
 #if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ)
 #define _TRACE_GPIO_H
 

kernel/trace/Kconfig

···
 
 	If unsure, say N
 
-config TRACING_EVENTS_GPIO
-	bool "Trace gpio events"
-	depends on GPIOLIB
-	default y
-	help
-	  Enable tracing events for gpio subsystem
-
 config GCOV_PROFILE_FTRACE
 	bool "Enable GCOV profiling on ftrace subsystem"
 	depends on GCOV_KERNEL