tracing: Remove definition of trace_*_rcuidle()

The trace_*_rcuidle() variant of a tracepoint was to handle places where a
tracepoint was located but RCU was not "watching". All those locations
have been removed, and RCU should be watching where all tracepoints are
located. We can now remove the trace_*_rcuidle() variant.

Cc: Masami Hiramatsu <[e-mail]>
Cc: Mathieu Desnoyers <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Joel Fernandes <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Acked-by: Peter Zijlstra (Intel) <[e-mail]>
Signed-off-by: Steven Rostedt (Google) <[e-mail]>

include/linux/tracepoint.h

···
 #endif /* CONFIG_HAVE_STATIC_CALL */
 
 /*
- * ARCH_WANTS_NO_INSTR archs are expected to have sanitized entry and idle
- * code that disallow any/all tracing/instrumentation when RCU isn't watching.
- */
-#ifdef CONFIG_ARCH_WANTS_NO_INSTR
-#define RCUIDLE_COND(rcuidle)	(rcuidle)
-#else
-/* srcu can't be used from NMI */
-#define RCUIDLE_COND(rcuidle)	(rcuidle && in_nmi())
-#endif
-
-/*
  * it_func[0] is never NULL because there is at least one element in the array
  * when the array itself is non NULL.
  */
-#define __DO_TRACE(name, args, cond, rcuidle)				\
+#define __DO_TRACE(name, args, cond)					\
 	do {								\
 		int __maybe_unused __idx = 0;				\
 									\
 		if (!(cond))						\
 			return;						\
 									\
-		if (WARN_ONCE(RCUIDLE_COND(rcuidle),			\
-			      "Bad RCU usage for tracepoint"))		\
-			return;						\
-									\
 		/* keep srcu and sched-rcu usage consistent */		\
 		preempt_disable_notrace();				\
 									\
-		/*							\
-		 * For rcuidle callers, use srcu since sched-rcu	\
-		 * doesn't work from the idle path.			\
-		 */							\
-		if (rcuidle) {						\
-			__idx = srcu_read_lock_notrace(&tracepoint_srcu);\
-			ct_irq_enter_irqson();				\
-		}							\
-									\
 		__DO_TRACE_CALL(name, TP_ARGS(args));			\
-									\
-		if (rcuidle) {						\
-			ct_irq_exit_irqson();				\
-			srcu_read_unlock_notrace(&tracepoint_srcu, __idx);\
-		}							\
 									\
 		preempt_enable_notrace();				\
 	} while (0)
-
-#ifndef MODULE
-#define __DECLARE_TRACE_RCU(name, proto, args, cond)			\
-	static inline void trace_##name##_rcuidle(proto)		\
-	{								\
-		if (static_branch_unlikely(&__tracepoint_##name.key))	\
-			__DO_TRACE(name,				\
-				TP_ARGS(args),				\
-				TP_CONDITION(cond), 1);			\
-	}
-#else
-#define __DECLARE_TRACE_RCU(name, proto, args, cond)
-#endif
 
 /*
  * Make sure the alignment of the structure in the __tracepoints section will
···
 		if (static_branch_unlikely(&__tracepoint_##name.key))	\
 			__DO_TRACE(name,				\
 				TP_ARGS(args),				\
-				TP_CONDITION(cond), 0);			\
+				TP_CONDITION(cond));			\
 		if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {		\
 			WARN_ONCE(!rcu_is_watching(),			\
 				  "RCU not watching for tracepoint");	\
 		}							\
 	}								\
-	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),		\
-			    PARAMS(cond))				\
 	static inline int						\
 	register_trace_##name(void (*probe)(data_proto), void *data)	\
 	{								\
···
 #else /* !TRACEPOINTS_ENABLED */
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto)		\
 	static inline void trace_##name(proto)				\
-	{ }								\
-	static inline void trace_##name##_rcuidle(proto)		\
 	{ }								\
 	static inline int						\
 	register_trace_##name(void (*probe)(data_proto),		\

include/trace/events/preemptirq.h

···
 #else
 #define trace_irq_enable(...)
 #define trace_irq_disable(...)
-#define trace_irq_enable_rcuidle(...)
-#define trace_irq_disable_rcuidle(...)
 #endif
 
 #ifdef CONFIG_TRACE_PREEMPT_TOGGLE
···
 #else
 #define trace_preempt_enable(...)
 #define trace_preempt_disable(...)
-#define trace_preempt_enable_rcuidle(...)
-#define trace_preempt_disable_rcuidle(...)
 #endif
 
 #endif /* _TRACE_PREEMPTIRQ_H */
···
 #else /* !CONFIG_PREEMPTIRQ_TRACEPOINTS */
 #define trace_irq_enable(...)
 #define trace_irq_disable(...)
-#define trace_irq_enable_rcuidle(...)
-#define trace_irq_disable_rcuidle(...)
 #define trace_preempt_enable(...)
 #define trace_preempt_disable(...)
-#define trace_preempt_enable_rcuidle(...)
-#define trace_preempt_disable_rcuidle(...)
 #endif

kernel/trace/trace_preemptirq.c

···
 #define CREATE_TRACE_POINTS
 #include <trace/events/preemptirq.h>
 
-/*
- * Use regular trace points on architectures that implement noinstr
- * tooling: these calls will only happen with RCU enabled, which can
- * use a regular tracepoint.
- *
- * On older architectures, use the rcuidle tracing methods (which
- * aren't NMI-safe - so exclude NMI contexts):
- */
-#ifdef CONFIG_ARCH_WANTS_NO_INSTR
-#define trace(point)	trace_##point
-#else
-#define trace(point)	if (!in_nmi()) trace_##point##_rcuidle
-#endif
-
 #ifdef CONFIG_TRACE_IRQFLAGS
 /* Per-cpu variable to prevent redundant calls when IRQs already off */
 static DEFINE_PER_CPU(int, tracing_irq_cpu);
···
 void trace_hardirqs_on_prepare(void)
 {
 	if (this_cpu_read(tracing_irq_cpu)) {
-		trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1);
+		trace_irq_enable(CALLER_ADDR0, CALLER_ADDR1);
 		tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
 		this_cpu_write(tracing_irq_cpu, 0);
 	}
···
 void trace_hardirqs_on(void)
 {
 	if (this_cpu_read(tracing_irq_cpu)) {
-		trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1);
+		trace_irq_enable(CALLER_ADDR0, CALLER_ADDR1);
 		tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
 		this_cpu_write(tracing_irq_cpu, 0);
 	}
···
 	if (!this_cpu_read(tracing_irq_cpu)) {
 		this_cpu_write(tracing_irq_cpu, 1);
 		tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
-		trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1);
+		trace_irq_disable(CALLER_ADDR0, CALLER_ADDR1);
 	}
 
 }
···
 	if (!this_cpu_read(tracing_irq_cpu)) {
 		this_cpu_write(tracing_irq_cpu, 1);
 		tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
-		trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1);
+		trace_irq_disable(CALLER_ADDR0, CALLER_ADDR1);
 	}
 }
 EXPORT_SYMBOL(trace_hardirqs_off);
···
 
 void trace_preempt_on(unsigned long a0, unsigned long a1)
 {
-	trace(preempt_enable)(a0, a1);
+	trace_preempt_enable(a0, a1);
 	tracer_preempt_on(a0, a1);
 }
 
 void trace_preempt_off(unsigned long a0, unsigned long a1)
 {
-	trace(preempt_disable)(a0, a1);
+	trace_preempt_disable(a0, a1);
 	tracer_preempt_off(a0, a1);
 }
 #endif

scripts/tags.sh

···
 	'/^BPF_CALL_[0-9]([[:space:]]*\([[:alnum:]_]*\).*/\1/'
 	'/^COMPAT_SYSCALL_DEFINE[0-9]([[:space:]]*\([[:alnum:]_]*\).*/compat_sys_\1/'
 	'/^TRACE_EVENT([[:space:]]*\([[:alnum:]_]*\).*/trace_\1/'
-	'/^TRACE_EVENT([[:space:]]*\([[:alnum:]_]*\).*/trace_\1_rcuidle/'
 	'/^DEFINE_EVENT([^,)]*,[[:space:]]*\([[:alnum:]_]*\).*/trace_\1/'
-	'/^DEFINE_EVENT([^,)]*,[[:space:]]*\([[:alnum:]_]*\).*/trace_\1_rcuidle/'
 	'/^DEFINE_INSN_CACHE_OPS([[:space:]]*\([[:alnum:]_]*\).*/get_\1_slot/'
 	'/^DEFINE_INSN_CACHE_OPS([[:space:]]*\([[:alnum:]_]*\).*/free_\1_slot/'
 	'/^PAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/Page\1/'